pgtap.sql

-- This file defines pgTAP, a collection of functions for TAP-based unit
-- testing. It is distributed under the revised FreeBSD license.
--
-- The home page for the pgTAP project is:
--
-- https://pgtap.org/

CREATE OR REPLACE FUNCTION pg_version()
RETURNS text AS 'SELECT current_setting(''server_version'')'
LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION pg_version_num()
RETURNS integer AS $$
    SELECT current_setting('server_version_num')::integer;
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION os_name()
RETURNS TEXT AS 'SELECT ''linux''::text;'
LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION pgtap_version()
RETURNS NUMERIC AS 'SELECT 1.2;'
LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION plan( integer )
RETURNS TEXT AS $$
DECLARE
    rcount INTEGER;
BEGIN
    BEGIN
        EXECUTE '
            CREATE TEMP SEQUENCE __tcache___id_seq;
            CREATE TEMP TABLE __tcache__ (
                id    INTEGER NOT NULL DEFAULT nextval(''__tcache___id_seq''),
                label TEXT    NOT NULL,
                value INTEGER NOT NULL,
                note  TEXT    NOT NULL DEFAULT ''''
            );
            CREATE UNIQUE INDEX __tcache___key ON __tcache__(id);
            GRANT ALL ON TABLE __tcache__ TO PUBLIC;
            GRANT ALL ON TABLE __tcache___id_seq TO PUBLIC;

            CREATE TEMP SEQUENCE __tresults___numb_seq;
            GRANT ALL ON TABLE __tresults___numb_seq TO PUBLIC;
        ';

    EXCEPTION WHEN duplicate_table THEN
        -- Raise an exception if there's already a plan.
        EXECUTE 'SELECT TRUE FROM __tcache__ WHERE label = ''plan''';
      GET DIAGNOSTICS rcount = ROW_COUNT;
        IF rcount > 0 THEN
           RAISE EXCEPTION 'You tried to plan twice!';
        END IF;
    END;

    -- Save the plan and return.
    PERFORM _set('plan', $1 );
    PERFORM _set('failed', 0 );
    RETURN '1..' || $1;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION no_plan()
RETURNS SETOF boolean AS $$
BEGIN
    PERFORM plan(0);
    RETURN;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _get ( text )
RETURNS integer AS $$
DECLARE
    ret integer;
BEGIN
    EXECUTE 'SELECT value FROM __tcache__ WHERE label = ' || quote_literal($1) || ' LIMIT 1' INTO ret;
    RETURN ret;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _get_latest ( text )
RETURNS integer[] AS $$
DECLARE
    ret integer[];
BEGIN
    EXECUTE 'SELECT ARRAY[id, value] FROM __tcache__ WHERE label = ' ||
    quote_literal($1) || ' AND id = (SELECT MAX(id) FROM __tcache__ WHERE label = ' ||
    quote_literal($1) || ') LIMIT 1' INTO ret;
    RETURN ret;
EXCEPTION WHEN undefined_table THEN
   RAISE EXCEPTION 'You tried to run a test without a plan! Gotta have a plan';
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _get_latest ( text, integer )
RETURNS integer AS $$
DECLARE
    ret integer;
BEGIN
    EXECUTE 'SELECT MAX(id) FROM __tcache__ WHERE label = ' ||
    quote_literal($1) || ' AND value = ' || $2 INTO ret;
    RETURN ret;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _get_note ( text )
RETURNS text AS $$
DECLARE
    ret text;
BEGIN
    EXECUTE 'SELECT note FROM __tcache__ WHERE label = ' || quote_literal($1) || ' LIMIT 1' INTO ret;
    RETURN ret;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _get_note ( integer )
RETURNS text AS $$
DECLARE
    ret text;
BEGIN
    EXECUTE 'SELECT note FROM __tcache__ WHERE id = ' || $1 || ' LIMIT 1' INTO ret;
    RETURN ret;
END;
$$ LANGUAGE plpgsql strict;

CREATE OR REPLACE FUNCTION _set ( text, integer, text )
RETURNS integer AS $$
DECLARE
    rcount integer;
BEGIN
    EXECUTE 'UPDATE __tcache__ SET value = ' || $2
        || CASE WHEN $3 IS NULL THEN '' ELSE ', note = ' || quote_literal($3) END
        || ' WHERE label = ' || quote_literal($1);
    GET DIAGNOSTICS rcount = ROW_COUNT;
    IF rcount = 0 THEN
       RETURN _add( $1, $2, $3 );
    END IF;
    RETURN $2;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _set ( text, integer )
RETURNS integer AS $$
    SELECT _set($1, $2, '')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _set ( integer, integer )
RETURNS integer AS $$
BEGIN
    EXECUTE 'UPDATE __tcache__ SET value = ' || $2
        || ' WHERE id = ' || $1;
    RETURN $2;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _add ( text, integer, text )
RETURNS integer AS $$
BEGIN
    EXECUTE 'INSERT INTO __tcache__ (label, value, note) values (' ||
    quote_literal($1) || ', ' || $2 || ', ' || quote_literal(COALESCE($3, '')) || ')';
    RETURN $2;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _add ( text, integer )
RETURNS integer AS $$
    SELECT _add($1, $2, '')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION add_result ( bool, bool, text, text, text )
RETURNS integer AS $$
BEGIN
    IF NOT $1 THEN PERFORM _set('failed', _get('failed') + 1); END IF;
    RETURN nextval('__tresults___numb_seq');
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION num_failed ()
RETURNS INTEGER AS $$
    SELECT _get('failed');
$$ LANGUAGE SQL strict;

CREATE OR REPLACE FUNCTION _finish (INTEGER, INTEGER, INTEGER, BOOLEAN DEFAULT NULL)
RETURNS SETOF TEXT AS $$
DECLARE
    curr_test ALIAS FOR $1;
    exp_tests INTEGER := $2;
    num_faild ALIAS FOR $3;
    plural    CHAR;
    raise_ex  ALIAS FOR $4;
BEGIN
    plural    := CASE exp_tests WHEN 1 THEN '' ELSE 's' END;

    IF curr_test IS NULL THEN
        RAISE EXCEPTION '# No tests run!';
    END IF;

    IF exp_tests = 0 OR exp_tests IS NULL THEN
         -- No plan. Output one now.
        exp_tests = curr_test;
        RETURN NEXT '1..' || exp_tests;
    END IF;

    IF curr_test <> exp_tests THEN
        RETURN NEXT diag(
            'Looks like you planned ' || exp_tests || ' test' ||
            plural || ' but ran ' || curr_test
        );
    ELSIF num_faild > 0 THEN
        IF raise_ex THEN
            RAISE EXCEPTION  '% test% failed of %', num_faild, CASE num_faild WHEN 1 THEN '' ELSE 's' END, exp_tests;
        END IF;
        RETURN NEXT diag(
            'Looks like you failed ' || num_faild || ' test' ||
            CASE num_faild WHEN 1 THEN '' ELSE 's' END
            || ' of ' || exp_tests
        );
    ELSE

    END IF;
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION finish (exception_on_failure BOOLEAN DEFAULT NULL)
RETURNS SETOF TEXT AS $$
    SELECT * FROM _finish(
        _get('curr_test'),
        _get('plan'),
        num_failed(),
        $1
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION diag ( msg text )
RETURNS TEXT AS $$
    SELECT '# ' || replace(
       replace(
            replace( $1, E'\r\n', E'\n# ' ),
            E'\n',
            E'\n# '
        ),
        E'\r',
        E'\n# '
    );
$$ LANGUAGE sql strict;

CREATE OR REPLACE FUNCTION diag ( msg anyelement )
RETURNS TEXT AS $$
    SELECT diag($1::text);
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION diag( VARIADIC text[] )
RETURNS TEXT AS $$
    SELECT diag(array_to_string($1, ''));
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION diag( VARIADIC anyarray )
RETURNS TEXT AS $$
    SELECT diag(array_to_string($1, ''));
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION ok ( boolean, text )
RETURNS TEXT AS $$
DECLARE
   aok      ALIAS FOR $1;
   descr    text := $2;
   test_num INTEGER;
   todo_why TEXT;
   ok       BOOL;
BEGIN
   todo_why := _todo();
   ok       := CASE
       WHEN aok = TRUE THEN aok
       WHEN todo_why IS NULL THEN COALESCE(aok, false)
       ELSE TRUE
    END;
    IF _get('plan') IS NULL THEN
        RAISE EXCEPTION 'You tried to run a test without a plan! Gotta have a plan';
    END IF;

    test_num := add_result(
        ok,
        COALESCE(aok, false),
        descr,
        CASE WHEN todo_why IS NULL THEN '' ELSE 'todo' END,
        COALESCE(todo_why, '')
    );

    RETURN (CASE aok WHEN TRUE THEN '' ELSE 'not ' END)
           || 'ok ' || _set( 'curr_test', test_num )
           || CASE descr WHEN '' THEN '' ELSE COALESCE( ' - ' || substr(diag( descr ), 3), '' ) END
           || COALESCE( ' ' || diag( 'TODO ' || todo_why ), '')
           || CASE aok WHEN TRUE THEN '' ELSE E'\n' ||
                diag('Failed ' ||
                CASE WHEN todo_why IS NULL THEN '' ELSE '(TODO) ' END ||
                'test ' || test_num ||
                CASE descr WHEN '' THEN '' ELSE COALESCE(': "' || descr || '"', '') END ) ||
                CASE WHEN aok IS NULL THEN E'\n' || diag('    (test result was NULL)') ELSE '' END
           END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION ok ( boolean )
RETURNS TEXT AS $$
    SELECT ok( $1, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION is (anyelement, anyelement, text)
RETURNS TEXT AS $$
DECLARE
    result BOOLEAN;
    output TEXT;
BEGIN
    -- Would prefer $1 IS NOT DISTINCT FROM, but that's not supported by 8.1.
    result := NOT $1 IS DISTINCT FROM $2;
    output := ok( result, $3 );
    RETURN output || CASE result WHEN TRUE THEN '' ELSE E'\n' || diag(
           '        have: ' || CASE WHEN $1 IS NULL THEN 'NULL' ELSE $1::text END ||
        E'\n        want: ' || CASE WHEN $2 IS NULL THEN 'NULL' ELSE $2::text END
    ) END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION is (anyelement, anyelement)
RETURNS TEXT AS $$
    SELECT is( $1, $2, NULL);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION isnt (anyelement, anyelement, text)
RETURNS TEXT AS $$
DECLARE
    result BOOLEAN;
    output TEXT;
BEGIN
    result := $1 IS DISTINCT FROM $2;
    output := ok( result, $3 );
    RETURN output || CASE result WHEN TRUE THEN '' ELSE E'\n' || diag(
           '        have: ' || COALESCE( $1::text, 'NULL' ) ||
        E'\n        want: anything else'
    ) END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION isnt (anyelement, anyelement)
RETURNS TEXT AS $$
    SELECT isnt( $1, $2, NULL);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _alike ( BOOLEAN, ANYELEMENT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    result ALIAS FOR $1;
    got    ALIAS FOR $2;
    rx     ALIAS FOR $3;
    descr  ALIAS FOR $4;
    output TEXT;
BEGIN
    output := ok( result, descr );
    RETURN output || CASE result WHEN TRUE THEN '' ELSE E'\n' || diag(
           '                  ' || COALESCE( quote_literal(got), 'NULL' ) ||
       E'\n   doesn''t match: ' || COALESCE( quote_literal(rx), 'NULL' )
    ) END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION matches ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~ $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION matches ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~ $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION imatches ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~* $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION imatches ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~* $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION alike ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~~ $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION alike ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~~ $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION ialike ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~~* $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION ialike ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _alike( $1 ~~* $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _unalike ( BOOLEAN, ANYELEMENT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    result ALIAS FOR $1;
    got    ALIAS FOR $2;
    rx     ALIAS FOR $3;
    descr  ALIAS FOR $4;
    output TEXT;
BEGIN
    output := ok( result, descr );
    RETURN output || CASE result WHEN TRUE THEN '' ELSE E'\n' || diag(
           '                  ' || COALESCE( quote_literal(got), 'NULL' ) ||
        E'\n         matches: ' || COALESCE( quote_literal(rx), 'NULL' )
    ) END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION doesnt_match ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~ $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION doesnt_match ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~ $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION doesnt_imatch ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~* $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION doesnt_imatch ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~* $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION unalike ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~~ $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION unalike ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~~ $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION unialike ( anyelement, text, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~~* $2, $1, $2, $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION unialike ( anyelement, text )
RETURNS TEXT AS $$
    SELECT _unalike( $1 !~~* $2, $1, $2, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION cmp_ok (anyelement, text, anyelement, text)
RETURNS TEXT AS $$
DECLARE
    have   ALIAS FOR $1;
    op     ALIAS FOR $2;
    want   ALIAS FOR $3;
    descr  ALIAS FOR $4;
    result BOOLEAN;
    output TEXT;
BEGIN
    EXECUTE 'SELECT ' ||
            COALESCE(quote_literal( have ), 'NULL') || '::' || pg_typeof(have) || ' '
            || op || ' ' ||
            COALESCE(quote_literal( want ), 'NULL') || '::' || pg_typeof(want)
       INTO result;
    output := ok( COALESCE(result, FALSE), descr );
    RETURN output || CASE result WHEN TRUE THEN '' ELSE E'\n' || diag(
           '    ' || COALESCE( quote_literal(have), 'NULL' ) ||
           E'\n        ' || op ||
           E'\n    ' || COALESCE( quote_literal(want), 'NULL' )
    ) END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION cmp_ok (anyelement, text, anyelement)
RETURNS TEXT AS $$
    SELECT cmp_ok( $1, $2, $3, NULL );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION pass ( text )
RETURNS TEXT AS $$
    SELECT ok( TRUE, $1 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION pass ()
RETURNS TEXT AS $$
    SELECT ok( TRUE, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION fail ( text )
RETURNS TEXT AS $$
    SELECT ok( FALSE, $1 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION fail ()
RETURNS TEXT AS $$
    SELECT ok( FALSE, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION todo ( why text, how_many int )
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', COALESCE(how_many, 1), COALESCE(why, ''));
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo ( how_many int, why text )
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', COALESCE(how_many, 1), COALESCE(why, ''));
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo ( why text )
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', 1, COALESCE(why, ''));
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo ( how_many int )
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', COALESCE(how_many, 1), '');
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo_start (text)
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', -1, COALESCE($1, ''));
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo_start ()
RETURNS SETOF BOOLEAN AS $$
BEGIN
    PERFORM _add('todo', -1, '');
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION in_todo ()
RETURNS BOOLEAN AS $$
DECLARE
    todos integer;
BEGIN
    todos := _get('todo');
    RETURN CASE WHEN todos IS NULL THEN FALSE ELSE TRUE END;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION todo_end ()
RETURNS SETOF BOOLEAN AS $$
DECLARE
    id integer;
BEGIN
    id := _get_latest( 'todo', -1 );
    IF id IS NULL THEN
        RAISE EXCEPTION 'todo_end() called without todo_start()';
    END IF;
    EXECUTE 'DELETE FROM __tcache__ WHERE id = ' || id;
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _todo()
RETURNS TEXT AS $$
DECLARE
    todos INT[];
    note text;
BEGIN
    -- Get the latest id and value, because todo() might have been called
    -- again before the todos ran out for the first call to todo(). This
    -- allows them to nest.
    todos := _get_latest('todo');
    IF todos IS NULL THEN
        -- No todos.
        RETURN NULL;
    END IF;
    IF todos[2] = 0 THEN
        -- Todos depleted. Clean up.
        EXECUTE 'DELETE FROM __tcache__ WHERE id = ' || todos[1];
        RETURN NULL;
    END IF;
    -- Decrement the count of counted todos and return the reason.
    IF todos[2] <> -1 THEN
        PERFORM _set(todos[1], todos[2] - 1);
    END IF;
    note := _get_note(todos[1]);

    IF todos[2] = 1 THEN
        -- This was the last todo, so delete the record.
        EXECUTE 'DELETE FROM __tcache__ WHERE id = ' || todos[1];
    END IF;

    RETURN note;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION skip ( why text, how_many int )
RETURNS TEXT AS $$
DECLARE
    output TEXT[];
BEGIN
    output := '{}';
    FOR i IN 1..how_many LOOP
        output = array_append(
            output,
            ok( TRUE ) || ' ' || diag( 'SKIP' || COALESCE( ' ' || why, '') )
        );
    END LOOP;
    RETURN array_to_string(output, E'\n');
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION skip ( text )
RETURNS TEXT AS $$
    SELECT ok( TRUE ) || ' ' || diag( 'SKIP' || COALESCE(' ' || $1, '') );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION skip( int, text )
RETURNS TEXT AS 'SELECT skip($2, $1)'
LANGUAGE sql;

CREATE OR REPLACE FUNCTION skip( int )
RETURNS TEXT AS 'SELECT skip(NULL, $1)'
LANGUAGE sql;

CREATE OR REPLACE FUNCTION _query( TEXT )
RETURNS TEXT AS $$
    SELECT CASE
        WHEN $1 LIKE '"%' OR $1 !~ '[[:space:]]' THEN 'EXECUTE ' || $1
        ELSE $1
    END;
$$ LANGUAGE SQL;

-- throws_ok ( sql, errcode, errmsg, description )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, CHAR(5), TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    query     TEXT := _query($1);
    errcode   ALIAS FOR $2;
    errmsg    ALIAS FOR $3;
    desctext  ALIAS FOR $4;
    descr     TEXT;
BEGIN
    descr := COALESCE(
          desctext,
          'threw ' || errcode || ': ' || errmsg,
          'threw ' || errcode,
          'threw ' || errmsg,
          'threw an exception'
    );
    EXECUTE query;
    RETURN ok( FALSE, descr ) || E'\n' || diag(
           '      caught: no exception' ||
        E'\n      wanted: ' || COALESCE( errcode, 'an exception' )
    );
EXCEPTION WHEN OTHERS OR ASSERT_FAILURE THEN
    IF (errcode IS NULL OR SQLSTATE = errcode)
        AND ( errmsg IS NULL OR SQLERRM = errmsg)
    THEN
        -- The expected errcode and/or message was thrown.
        RETURN ok( TRUE, descr );
    ELSE
        -- This was not the expected errcode or errmsg.
        RETURN ok( FALSE, descr ) || E'\n' || diag(
               '      caught: ' || SQLSTATE || ': ' || SQLERRM ||
            E'\n      wanted: ' || COALESCE( errcode, 'an exception' ) ||
            COALESCE( ': ' || errmsg, '')
        );
    END IF;
END;
$$ LANGUAGE plpgsql;

-- throws_ok ( sql, errcode, errmsg )
-- throws_ok ( sql, errmsg, description )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF octet_length($2) = 5 THEN
        RETURN throws_ok( $1, $2::char(5), $3, NULL );
    ELSE
        RETURN throws_ok( $1, NULL, $2, $3 );
    END IF;
END;
$$ LANGUAGE plpgsql;

-- throws_ok ( query, errcode )
-- throws_ok ( query, errmsg )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF octet_length($2) = 5 THEN
        RETURN throws_ok( $1, $2::char(5), NULL, NULL );
    ELSE
        RETURN throws_ok( $1, NULL, $2, NULL );
    END IF;
END;
$$ LANGUAGE plpgsql;

-- throws_ok ( sql )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT )
RETURNS TEXT AS $$
    SELECT throws_ok( $1, NULL, NULL, NULL );
$$ LANGUAGE SQL;

-- Magically cast integer error codes.
-- throws_ok ( sql, errcode, errmsg, description )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, int4, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT throws_ok( $1, $2::char(5), $3, $4 );
$$ LANGUAGE SQL;

-- throws_ok ( sql, errcode, errmsg )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, int4, TEXT )
RETURNS TEXT AS $$
    SELECT throws_ok( $1, $2::char(5), $3, NULL );
$$ LANGUAGE SQL;

-- throws_ok ( sql, errcode )
CREATE OR REPLACE FUNCTION throws_ok ( TEXT, int4 )
RETURNS TEXT AS $$
    SELECT throws_ok( $1, $2::char(5), NULL, NULL );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _error_diag( TEXT, TEXT, TEXT, TEXT, TEXT, TEXT, TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT COALESCE(
               COALESCE( NULLIF($1, '') || ': ', '' ) || COALESCE( NULLIF($2, ''), '' ),
               'NO ERROR FOUND'
           )
        || COALESCE(E'\n        DETAIL:     ' || nullif($3, ''), '')
        || COALESCE(E'\n        HINT:       ' || nullif($4, ''), '')
        || COALESCE(E'\n        SCHEMA:     ' || nullif($6, ''), '')
        || COALESCE(E'\n        TABLE:      ' || nullif($7, ''), '')
        || COALESCE(E'\n        COLUMN:     ' || nullif($8, ''), '')
        || COALESCE(E'\n        CONSTRAINT: ' || nullif($9, ''), '')
        || COALESCE(E'\n        TYPE:       ' || nullif($10, ''), '')
        -- We need to manually indent all the context lines
        || COALESCE(E'\n        CONTEXT:\n'
               || regexp_replace(NULLIF( $5, ''), '^', '            ', 'gn'
           ), '');
$$ LANGUAGE sql IMMUTABLE;

-- lives_ok( sql, description )
CREATE OR REPLACE FUNCTION lives_ok ( TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    code  TEXT := _query($1);
    descr ALIAS FOR $2;
    detail  text;
    hint    text;
    context text;
    schname text;
    tabname text;
    colname text;
    chkname text;
    typname text;
BEGIN
    EXECUTE code;
    RETURN ok( TRUE, descr );
EXCEPTION WHEN OTHERS OR ASSERT_FAILURE THEN
    -- There should have been no exception.
    GET STACKED DIAGNOSTICS
        detail  = PG_EXCEPTION_DETAIL,
        hint    = PG_EXCEPTION_HINT,
        context = PG_EXCEPTION_CONTEXT,
        schname = SCHEMA_NAME,
        tabname = TABLE_NAME,
        colname = COLUMN_NAME,
        chkname = CONSTRAINT_NAME,
        typname = PG_DATATYPE_NAME;
    RETURN ok( FALSE, descr ) || E'\n' || diag(
           '    died: ' || _error_diag(SQLSTATE, SQLERRM, detail, hint, context, schname, tabname, colname, chkname, typname)
    );
END;
$$ LANGUAGE plpgsql;

-- lives_ok( sql )
CREATE OR REPLACE FUNCTION lives_ok ( TEXT )
RETURNS TEXT AS $$
    SELECT lives_ok( $1, NULL );
$$ LANGUAGE SQL;

-- performs_ok ( sql, milliseconds, description )
CREATE OR REPLACE FUNCTION performs_ok ( TEXT, NUMERIC, TEXT )
RETURNS TEXT AS $$
DECLARE
    query     TEXT := _query($1);
    max_time  ALIAS FOR $2;
    descr     ALIAS FOR $3;
    starts_at TEXT;
    act_time  NUMERIC;
BEGIN
    starts_at := timeofday();
    EXECUTE query;
    act_time := extract( millisecond from timeofday()::timestamptz - starts_at::timestamptz);
    IF act_time < max_time THEN RETURN ok(TRUE, descr); END IF;
    RETURN ok( FALSE, descr ) || E'\n' || diag(
           '      runtime: ' || act_time || ' ms' ||
        E'\n      exceeds: ' || max_time || ' ms'
    );
END;
$$ LANGUAGE plpgsql;

-- performs_ok ( sql, milliseconds )
CREATE OR REPLACE FUNCTION performs_ok ( TEXT, NUMERIC )
RETURNS TEXT AS $$
    SELECT performs_ok(
        $1, $2, 'Should run in less than ' || $2 || ' ms'
    );
$$ LANGUAGE sql;

-- Convenience function to run a query many times and returns
-- the middle set of those times as defined by the last argument
-- e.g. _time_trials('SELECT 1', 100, 0.8) will execute 'SELECT 1'
-- 100 times, and return the execution times for the middle 80 runs
--
-- I could have left this logic in performs_within, but I have
-- plans to hook into this function for other purposes outside
-- of pgTAP
CREATE TYPE _time_trial_type
AS (a_time NUMERIC);
CREATE OR REPLACE FUNCTION _time_trials(TEXT, INT, NUMERIC)
RETURNS SETOF _time_trial_type AS $$
DECLARE
    query            TEXT := _query($1);
    iterations       ALIAS FOR $2;
    return_percent   ALIAS FOR $3;
    start_time       TEXT;
    act_time         NUMERIC;
    times            NUMERIC[];
    offset_it        INT;
    limit_it         INT;
    offset_percent   NUMERIC;
    a_time	     _time_trial_type;
BEGIN
    -- Execute the query over and over
    FOR i IN 1..iterations LOOP
        start_time := timeofday();
        EXECUTE query;
        -- Store the execution time for the run in an array of times
        times[i] := extract(millisecond from timeofday()::timestamptz - start_time::timestamptz);
    END LOOP;
    offset_percent := (1.0 - return_percent) / 2.0;
    -- Ensure that offset skips the bottom X% of runs, or set it to 0
    SELECT GREATEST((offset_percent * iterations)::int, 0) INTO offset_it;
    -- Ensure that with limit the query to returning only the middle X% of runs
    SELECT GREATEST((return_percent * iterations)::int, 1) INTO limit_it;

    FOR a_time IN SELECT times[i]
		  FROM generate_series(array_lower(times, 1), array_upper(times, 1)) i
                  ORDER BY 1
                  OFFSET offset_it
                  LIMIT limit_it LOOP
	RETURN NEXT a_time;
    END LOOP;
END;
$$ LANGUAGE plpgsql;

-- performs_within( sql, average_milliseconds, within, iterations, description )
CREATE OR REPLACE FUNCTION performs_within(TEXT, NUMERIC, NUMERIC, INT, TEXT)
RETURNS TEXT AS $$
DECLARE
    query          TEXT := _query($1);
    expected_avg   ALIAS FOR $2;
    within         ALIAS FOR $3;
    iterations     ALIAS FOR $4;
    descr          ALIAS FOR $5;
    avg_time       NUMERIC;
BEGIN
  SELECT avg(a_time) FROM _time_trials(query, iterations, 0.8) t1 INTO avg_time;
  IF abs(avg_time - expected_avg) < within THEN RETURN ok(TRUE, descr); END IF;
  RETURN ok(FALSE, descr) || E'\n' || diag(' average runtime: ' || avg_time || ' ms'
     || E'\n desired average: ' || expected_avg || ' +/- ' || within || ' ms'
    );
END;
$$ LANGUAGE plpgsql;

-- performs_within( sql, average_milliseconds, within, iterations )
CREATE OR REPLACE FUNCTION performs_within(TEXT, NUMERIC, NUMERIC, INT)
RETURNS TEXT AS $$
SELECT performs_within(
          $1, $2, $3, $4,
          'Should run within ' || $2 || ' +/- ' || $3 || ' ms');
$$ LANGUAGE sql;
-- performs_within( sql, average_milliseconds, within, description )
CREATE OR REPLACE FUNCTION performs_within(TEXT, NUMERIC, NUMERIC, TEXT)
RETURNS TEXT AS $$
SELECT performs_within(
          $1, $2, $3, 10, $4
        );
$$ LANGUAGE sql;

-- performs_within( sql, average_milliseconds, within )
CREATE OR REPLACE FUNCTION performs_within(TEXT, NUMERIC, NUMERIC)
RETURNS TEXT AS $$
SELECT performs_within(
          $1, $2, $3, 10,
          'Should run within ' || $2 || ' +/- ' || $3 || ' ms');
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _relexists ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE n.nspname = $1
           AND c.relname = $2
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _relexists ( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_class c
         WHERE pg_catalog.pg_table_is_visible(c.oid)
           AND c.relname = $1
    );
$$ LANGUAGE SQL;

-- has_relation( schema, relation, description )
CREATE OR REPLACE FUNCTION has_relation ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _relexists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_relation( relation, description )
CREATE OR REPLACE FUNCTION has_relation ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _relexists( $1 ), $2 );
$$ LANGUAGE SQL;

-- has_relation( relation )
CREATE OR REPLACE FUNCTION has_relation ( NAME )
RETURNS TEXT AS $$
    SELECT has_relation( $1, 'Relation ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_relation( schema, relation, description )
CREATE OR REPLACE FUNCTION hasnt_relation ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _relexists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_relation( relation, description )
CREATE OR REPLACE FUNCTION hasnt_relation ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _relexists( $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_relation( relation )
CREATE OR REPLACE FUNCTION hasnt_relation ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_relation( $1, 'Relation ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _rexists ( CHAR[], NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE c.relkind = ANY($1)
           AND n.nspname = $2
           AND c.relname = $3
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _rexists ( CHAR[], NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_class c
         WHERE c.relkind = ANY($1)
           AND pg_catalog.pg_table_is_visible(c.oid)
           AND c.relname = $2
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _rexists ( CHAR, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT _rexists(ARRAY[$1], $2, $3);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _rexists ( CHAR, NAME )
RETURNS BOOLEAN AS $$
SELECT _rexists(ARRAY[$1], $2);
$$ LANGUAGE SQL;

-- has_table( schema, table, description )
CREATE OR REPLACE FUNCTION has_table ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( '{r,p}'::char[], $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_table( schema, table )
CREATE OR REPLACE FUNCTION has_table ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _rexists( '{r,p}'::char[], $1, $2 ),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_table( table, description )
CREATE OR REPLACE FUNCTION has_table ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( '{r,p}'::char[], $1 ), $2 );
$$ LANGUAGE SQL;

-- has_table( table )
CREATE OR REPLACE FUNCTION has_table ( NAME )
RETURNS TEXT AS $$
    SELECT has_table( $1, 'Table ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_table( schema, table, description )
CREATE OR REPLACE FUNCTION hasnt_table ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( '{r,p}'::char[], $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_table( schema, table )
CREATE OR REPLACE FUNCTION hasnt_table ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _rexists( '{r,p}'::char[], $1, $2 ),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist'
    );
$$ LANGUAGE SQL;

-- hasnt_table( table, description )
CREATE OR REPLACE FUNCTION hasnt_table ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( '{r,p}'::char[], $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_table( table )
CREATE OR REPLACE FUNCTION hasnt_table ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_table( $1, 'Table ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- has_view( schema, view, description )
CREATE OR REPLACE FUNCTION has_view ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'v', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_view( schema, view )
CREATE OR REPLACE FUNCTION has_view ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_view ($1, $2, 
    'View ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist'
    );    
$$ LANGUAGE SQL;

-- has_view( view, description )
CREATE OR REPLACE FUNCTION has_view ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'v', $1 ), $2 );
$$ LANGUAGE SQL;

-- has_view( view )
CREATE OR REPLACE FUNCTION has_view ( NAME )
RETURNS TEXT AS $$
    SELECT has_view( $1, 'View ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_view( schema, view, description )
CREATE OR REPLACE FUNCTION hasnt_view ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'v', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_view( schema, table )
CREATE OR REPLACE FUNCTION hasnt_view ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT hasnt_view( $1, $2,
        'View ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist'
    );
$$ LANGUAGE SQL;


-- hasnt_view( view, description )
CREATE OR REPLACE FUNCTION hasnt_view ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'v', $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_view( view )
CREATE OR REPLACE FUNCTION hasnt_view ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_view( $1, 'View ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- has_sequence( schema, sequence, description )
CREATE OR REPLACE FUNCTION has_sequence ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'S', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_sequence( schema, sequence )
CREATE OR REPLACE FUNCTION has_sequence ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _rexists( 'S', $1, $2 ),
        'Sequence ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_sequence( sequence, description )
CREATE OR REPLACE FUNCTION has_sequence ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'S', $1 ), $2 );
$$ LANGUAGE SQL;

-- has_sequence( sequence )
CREATE OR REPLACE FUNCTION has_sequence ( NAME )
RETURNS TEXT AS $$
    SELECT has_sequence( $1, 'Sequence ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_sequence( schema, sequence, description )
CREATE OR REPLACE FUNCTION hasnt_sequence ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'S', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_sequence( sequence, description )
CREATE OR REPLACE FUNCTION hasnt_sequence ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'S', $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_sequence( sequence )
CREATE OR REPLACE FUNCTION hasnt_sequence ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_sequence( $1, 'Sequence ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- has_foreign_table( schema, table, description )
CREATE OR REPLACE FUNCTION has_foreign_table ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'f', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_foreign_table( schema, table )
CREATE OR REPLACE FUNCTION has_foreign_table ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _rexists( 'f', $1, $2 ),
        'Foreign table ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_foreign_table( table, description )
CREATE OR REPLACE FUNCTION has_foreign_table ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'f', $1 ), $2 );
$$ LANGUAGE SQL;

-- has_foreign_table( table )
CREATE OR REPLACE FUNCTION has_foreign_table ( NAME )
RETURNS TEXT AS $$
    SELECT has_foreign_table( $1, 'Foreign table ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_foreign_table( schema, table, description )
CREATE OR REPLACE FUNCTION hasnt_foreign_table ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'f', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_foreign_table( schema, table )
CREATE OR REPLACE FUNCTION hasnt_foreign_table ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _rexists( 'f', $1, $2 ),
        'Foreign table ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist'
    );
$$ LANGUAGE SQL;

-- hasnt_foreign_table( table, description )
CREATE OR REPLACE FUNCTION hasnt_foreign_table ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'f', $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_foreign_table( table )
CREATE OR REPLACE FUNCTION hasnt_foreign_table ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_foreign_table( $1, 'Foreign table ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- has_composite( schema, type, description )
CREATE OR REPLACE FUNCTION has_composite ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'c', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_composite( type, description )
CREATE OR REPLACE FUNCTION has_composite ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'c', $1 ), $2 );
$$ LANGUAGE SQL;

-- has_composite( type )
CREATE OR REPLACE FUNCTION has_composite ( NAME )
RETURNS TEXT AS $$
    SELECT has_composite( $1, 'Composite type ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_composite( schema, type, description )
CREATE OR REPLACE FUNCTION hasnt_composite ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'c', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_composite( type, description )
CREATE OR REPLACE FUNCTION hasnt_composite ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'c', $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_composite( type )
CREATE OR REPLACE FUNCTION hasnt_composite ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_composite( $1, 'Composite type ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _cexists ( NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
          JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
         WHERE n.nspname = $1
           AND c.relname = $2
           AND a.attnum > 0
           AND NOT a.attisdropped
           AND a.attname = $3
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _cexists ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_class c
          JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
         WHERE c.relname = $1
           AND pg_catalog.pg_table_is_visible(c.oid)
           AND a.attnum > 0
           AND NOT a.attisdropped
           AND a.attname = $2
    );
$$ LANGUAGE SQL;

-- has_column( schema, table, column, description )
CREATE OR REPLACE FUNCTION has_column ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _cexists( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- has_column( table, column, description )
CREATE OR REPLACE FUNCTION has_column ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _cexists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_column( table, column )
CREATE OR REPLACE FUNCTION has_column ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_column( $1, $2, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_column( schema, table, column, description )
CREATE OR REPLACE FUNCTION hasnt_column ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _cexists( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- hasnt_column( table, column, description )
CREATE OR REPLACE FUNCTION hasnt_column ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _cexists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_column( table, column )
CREATE OR REPLACE FUNCTION hasnt_column ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT hasnt_column( $1, $2, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist' );
$$ LANGUAGE SQL;

-- _col_is_null( schema, table, column, desc, null )
CREATE OR REPLACE FUNCTION _col_is_null ( NAME, NAME, NAME, TEXT, bool )
RETURNS TEXT AS $$
DECLARE
    qcol CONSTANT text := quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3);
    c_desc CONSTANT text := coalesce(
        $4,
        'Column ' || qcol || ' should '
            || CASE WHEN $5 THEN 'be NOT' ELSE 'allow' END || ' NULL'
    );
BEGIN
    IF NOT _cexists( $1, $2, $3 ) THEN
        RETURN fail( c_desc ) || E'\n'
            || diag ('    Column ' || qcol || ' does not exist' );
    END IF;
    RETURN ok(
        EXISTS(
            SELECT true
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE n.nspname = $1
               AND c.relname = $2
               AND a.attnum  > 0
               AND NOT a.attisdropped
               AND a.attname    = $3
               AND a.attnotnull = $5
        ), c_desc
    );
END;
$$ LANGUAGE plpgsql;

-- _col_is_null( table, column, desc, null )
CREATE OR REPLACE FUNCTION _col_is_null ( NAME, NAME, TEXT, bool )
RETURNS TEXT AS $$
DECLARE
    qcol CONSTANT text := quote_ident($1) || '.' || quote_ident($2);
    c_desc CONSTANT text := coalesce(
        $3,
        'Column ' || qcol || ' should '
            || CASE WHEN $4 THEN 'be NOT' ELSE 'allow' END || ' NULL'
    );
BEGIN
    IF NOT _cexists( $1, $2 ) THEN
        RETURN fail( c_desc ) || E'\n'
            || diag ('    Column ' || qcol || ' does not exist' );
    END IF;
    RETURN ok(
        EXISTS(
            SELECT true
              FROM pg_catalog.pg_class c
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE pg_catalog.pg_table_is_visible(c.oid)
               AND c.relname = $1
               AND a.attnum > 0
               AND NOT a.attisdropped
               AND a.attname    = $2
               AND a.attnotnull = $4
        ), c_desc
    );
END;
$$ LANGUAGE plpgsql;

-- col_not_null( schema, table, column, description )
-- col_not_null( schema, table, column )
CREATE OR REPLACE FUNCTION col_not_null ( schema_name NAME, table_name NAME, column_name NAME, description TEXT DEFAULT NULL )
RETURNS TEXT AS $$
    SELECT _col_is_null( $1, $2, $3, $4, true );
$$ LANGUAGE SQL;

-- col_not_null( table, column, description )
-- col_not_null( table, column )
CREATE OR REPLACE FUNCTION col_not_null ( table_name NAME, column_name NAME, description TEXT DEFAULT NULL )
RETURNS TEXT AS $$
    SELECT _col_is_null( $1, $2, $3, true );
$$ LANGUAGE SQL;

-- col_is_null( schema, table, column, description )
-- col_is_null( schema, table, column )
CREATE OR REPLACE FUNCTION col_is_null ( schema_name NAME, table_name NAME, column_name NAME, description TEXT DEFAULT NULL )
RETURNS TEXT AS $$
    SELECT _col_is_null( $1, $2, $3, $4, false );
$$ LANGUAGE SQL;

-- col_is_null( table, column, description )
-- col_is_null( table, column )
CREATE OR REPLACE FUNCTION col_is_null ( table_name NAME, column_name NAME, description TEXT DEFAULT NULL )
RETURNS TEXT AS $$
    SELECT _col_is_null( $1, $2, $3, false );
$$ LANGUAGE SQL;


CREATE OR REPLACE FUNCTION _get_col_type ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_class c     ON n.oid = c.relnamespace
      JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
     WHERE n.nspname = $1
       AND c.relname = $2
       AND a.attname = $3
       AND attnum    > 0
       AND NOT a.attisdropped
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_col_type ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
      FROM pg_catalog.pg_attribute a
      JOIN pg_catalog.pg_class c ON  a.attrelid = c.oid
     WHERE pg_catalog.pg_table_is_visible(c.oid)
       AND c.relname = $1
       AND a.attname = $2
       AND attnum    > 0
       AND NOT a.attisdropped
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_col_ns_type ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    -- Always include the namespace.
    SELECT CASE WHEN pg_catalog.pg_type_is_visible(t.oid)
                THEN quote_ident(tn.nspname) || '.'
                ELSE ''
           END || pg_catalog.format_type(a.atttypid, a.atttypmod)
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_class c      ON n.oid = c.relnamespace
      JOIN pg_catalog.pg_attribute a  ON c.oid = a.attrelid
      JOIN pg_catalog.pg_type t       ON a.atttypid = t.oid
      JOIN pg_catalog.pg_namespace tn ON t.typnamespace = tn.oid
     WHERE n.nspname = $1
       AND c.relname = $2
       AND a.attname = $3
       AND attnum    > 0
       AND NOT a.attisdropped
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _quote_ident_like(TEXT, TEXT)
RETURNS TEXT AS $$
DECLARE
    have    TEXT;
    pcision TEXT;
BEGIN
    -- Just return it if rhs isn't quoted.
    IF $2 !~ '"' THEN RETURN $1; END IF;

    -- If it's quoted ident without precision, return it quoted.
    IF $2 ~ '"$' THEN RETURN quote_ident($1); END IF;

    pcision := substring($1 FROM '[(][^")]+[)]$');

    -- Just quote it if thre is no precision.
    if pcision IS NULL THEN RETURN quote_ident($1); END IF;

    -- Quote the non-precision part and concatenate with precision.
    RETURN quote_ident(substring($1 FOR char_length($1) - char_length(pcision)))
        || pcision;
END;
$$ LANGUAGE plpgsql;

-- col_type_is( schema, table, column, schema, type, description )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have_type TEXT := _get_col_ns_type($1, $2, $3);
    want_type TEXT;
BEGIN
    IF have_type IS NULL THEN
        RETURN fail( $6 ) || E'\n' || diag (
            '   Column ' || COALESCE(quote_ident($1) || '.', '')
            || quote_ident($2) || '.' || quote_ident($3) || ' does not exist'
        );
    END IF;

    want_type := quote_ident($4) || '.' || _quote_ident_like($5, have_type);
    IF have_type = want_type THEN
        -- We're good to go.
        RETURN ok( true, $6 );
    END IF;

    -- Wrong data type. tell 'em what we really got.
    RETURN ok( false, $6 ) || E'\n' || diag(
           '        have: ' || have_type ||
        E'\n        want: ' || want_type
    );
END;
$$ LANGUAGE plpgsql;

-- col_type_is( schema, table, column, schema, type )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_type_is( $1, $2, $3, $4, $5, 'Column ' || quote_ident($1) || '.' || quote_ident($2)
        || '.' || quote_ident($3) || ' should be type ' || quote_ident($4) || '.' || $5);
$$ LANGUAGE SQL;

-- col_type_is( schema, table, column, type, description )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have_type TEXT;
    want_type TEXT;
BEGIN
    -- Get the data type.
    IF $1 IS NULL THEN
        have_type := _get_col_type($2, $3);
    ELSE
        have_type := _get_col_type($1, $2, $3);
    END IF;

    IF have_type IS NULL THEN
        RETURN fail( $5 ) || E'\n' || diag (
            '   Column ' || COALESCE(quote_ident($1) || '.', '')
            || quote_ident($2) || '.' || quote_ident($3) || ' does not exist'
        );
    END IF;

    want_type := _quote_ident_like($4, have_type);
    IF have_type = want_type THEN
        -- We're good to go.
        RETURN ok( true, $5 );
    END IF;

    -- Wrong data type. tell 'em what we really got.
    RETURN ok( false, $5 ) || E'\n' || diag(
           '        have: ' || have_type ||
        E'\n        want: ' || want_type
    );
END;
$$ LANGUAGE plpgsql;

-- col_type_is( schema, table, column, type )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_type_is( $1, $2, $3, $4, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3) || ' should be type ' || $4 );
$$ LANGUAGE SQL;

-- col_type_is( table, column, type, description )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT col_type_is( NULL, $1, $2, $3, $4 );
$$ LANGUAGE SQL;

-- col_type_is( table, column, type )
CREATE OR REPLACE FUNCTION col_type_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_type_is( $1, $2, $3, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should be type ' || $3 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _has_def ( NAME, NAME, NAME )
RETURNS boolean AS $$
    SELECT a.atthasdef
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
      JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
     WHERE n.nspname = $1
       AND c.relname = $2
       AND a.attnum > 0
       AND NOT a.attisdropped
       AND a.attname = $3
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_def ( NAME, NAME )
RETURNS boolean AS $$
    SELECT a.atthasdef
      FROM pg_catalog.pg_class c
      JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
     WHERE c.relname = $1
       AND a.attnum > 0
       AND NOT a.attisdropped
       AND a.attname = $2
       AND pg_catalog.pg_table_is_visible(c.oid)
$$ LANGUAGE sql;

-- col_has_default( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_has_default ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2, $3 ) THEN
        RETURN fail( $4 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3) || ' does not exist' );
    END IF;
    RETURN ok( _has_def( $1, $2, $3 ), $4 );
END
$$ LANGUAGE plpgsql;

-- col_has_default( table, column, description )
CREATE OR REPLACE FUNCTION col_has_default ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2 ) THEN
        RETURN fail( $3 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist' );
    END IF;
    RETURN ok( _has_def( $1, $2 ), $3 );
END;
$$ LANGUAGE plpgsql;

-- col_has_default( table, column )
CREATE OR REPLACE FUNCTION col_has_default ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_has_default( $1, $2, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should have a default' );
$$ LANGUAGE SQL;

-- col_hasnt_default( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_hasnt_default ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2, $3 ) THEN
        RETURN fail( $4 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3) || ' does not exist' );
    END IF;
    RETURN ok( NOT _has_def( $1, $2, $3 ), $4 );
END;
$$ LANGUAGE plpgsql;

-- col_hasnt_default( table, column, description )
CREATE OR REPLACE FUNCTION col_hasnt_default ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2 ) THEN
        RETURN fail( $3 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist' );
    END IF;
    RETURN ok( NOT _has_def( $1, $2 ), $3 );
END;
$$ LANGUAGE plpgsql;

-- col_hasnt_default( table, column )
CREATE OR REPLACE FUNCTION col_hasnt_default ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_hasnt_default( $1, $2, 'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should not have a default' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _def_is( TEXT, TEXT, anyelement, TEXT )
RETURNS TEXT AS $$
DECLARE
    thing text;
BEGIN
    -- Function, cast, or special SQL syntax.
    IF $1 ~ '^[^'']+[(]' OR $1 ~ '[)]::[^'']+$' OR $1 = ANY('{CURRENT_CATALOG,CURRENT_ROLE,CURRENT_SCHEMA,CURRENT_USER,SESSION_USER,USER,CURRENT_DATE,CURRENT_TIME,CURRENT_TIMESTAMP,LOCALTIME,LOCALTIMESTAMP}') THEN
        RETURN is( $1, $3, $4 );
    END IF;

    EXECUTE 'SELECT is('
             || COALESCE($1, 'NULL' || '::' || $2) || '::' || $2 || ', '
             || COALESCE(quote_literal($3), 'NULL') || '::' || $2 || ', '
             || COALESCE(quote_literal($4), 'NULL')
    || ')' INTO thing;
    RETURN thing;
END;
$$ LANGUAGE plpgsql;

-- _cdi( schema, table, column, default, description )
CREATE OR REPLACE FUNCTION _cdi ( NAME, NAME, NAME, anyelement, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2, $3 ) THEN
        RETURN fail( $5 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3) || ' does not exist' );
    END IF;

    IF NOT _has_def( $1, $2, $3 ) THEN
        RETURN fail( $5 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3) || ' has no default' );
    END IF;

    RETURN _def_is(
        pg_catalog.pg_get_expr(d.adbin, d.adrelid),
        pg_catalog.format_type(a.atttypid, a.atttypmod),
        $4, $5
    )
      FROM pg_catalog.pg_namespace n, pg_catalog.pg_class c, pg_catalog.pg_attribute a,
           pg_catalog.pg_attrdef d
     WHERE n.oid = c.relnamespace
       AND c.oid = a.attrelid
       AND a.atthasdef
       AND a.attrelid = d.adrelid
       AND a.attnum = d.adnum
       AND n.nspname = $1
       AND c.relname = $2
       AND a.attnum > 0
       AND NOT a.attisdropped
       AND a.attname = $3;
END;
$$ LANGUAGE plpgsql;

-- _cdi( table, column, default, description )
CREATE OR REPLACE FUNCTION _cdi ( NAME, NAME, anyelement, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF NOT _cexists( $1, $2 ) THEN
        RETURN fail( $4 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist' );
    END IF;

    IF NOT _has_def( $1, $2 ) THEN
        RETURN fail( $4 ) || E'\n'
            || diag ('    Column ' || quote_ident($1) || '.' || quote_ident($2) || ' has no default' );
    END IF;

    RETURN _def_is(
        pg_catalog.pg_get_expr(d.adbin, d.adrelid),
        pg_catalog.format_type(a.atttypid, a.atttypmod),
        $3, $4
    )
      FROM pg_catalog.pg_class c, pg_catalog.pg_attribute a, pg_catalog.pg_attrdef d
     WHERE c.oid = a.attrelid
       AND pg_table_is_visible(c.oid)
       AND a.atthasdef
       AND a.attrelid = d.adrelid
       AND a.attnum = d.adnum
       AND c.relname = $1
       AND a.attnum > 0
       AND NOT a.attisdropped
       AND a.attname = $2;
END;
$$ LANGUAGE plpgsql;

-- _cdi( table, column, default )
CREATE OR REPLACE FUNCTION _cdi ( NAME, NAME, anyelement )
RETURNS TEXT AS $$
    SELECT col_default_is(
        $1, $2, $3,
        'Column ' || quote_ident($1) || '.' || quote_ident($2) || ' should default to '
        || COALESCE( quote_literal($3), 'NULL')
    );
$$ LANGUAGE sql;

-- col_default_is( schema, table, column, default, description )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, NAME, anyelement, TEXT )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3, $4, $5 );
$$ LANGUAGE sql;

-- col_default_is( schema, table, column, default, description )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3, $4, $5 );
$$ LANGUAGE sql;

-- col_default_is( table, column, default, description )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, anyelement, TEXT )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3, $4 );
$$ LANGUAGE sql;

-- col_default_is( table, column, default, description )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3, $4 );
$$ LANGUAGE sql;

-- col_default_is( table, column, default )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, anyelement )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3 );
$$ LANGUAGE sql;

-- col_default_is( table, column, default::text )
CREATE OR REPLACE FUNCTION col_default_is ( NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT _cdi( $1, $2, $3 );
$$ LANGUAGE sql;

-- _hasc( schema, table, constraint_type )
CREATE OR REPLACE FUNCTION _hasc ( NAME, NAME, CHAR )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
            SELECT true
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c      ON c.relnamespace = n.oid
              JOIN pg_catalog.pg_constraint x ON c.oid = x.conrelid
             WHERE n.nspname = $1
               AND c.relname = $2
               AND x.contype = $3
    );
$$ LANGUAGE sql;

-- _hasc( table, constraint_type )
CREATE OR REPLACE FUNCTION _hasc ( NAME, CHAR )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
            SELECT true
              FROM pg_catalog.pg_class c
              JOIN pg_catalog.pg_constraint x ON c.oid = x.conrelid
             WHERE pg_table_is_visible(c.oid)
               AND c.relname = $1
               AND x.contype = $2
    );
$$ LANGUAGE sql;

-- has_pk( schema, table, description )
CREATE OR REPLACE FUNCTION has_pk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, $2, 'p' ), $3 );
$$ LANGUAGE sql;

-- has_pk( table, description )
CREATE OR REPLACE FUNCTION has_pk ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, 'p' ), $2 );
$$ LANGUAGE sql;

-- has_pk( table )
CREATE OR REPLACE FUNCTION has_pk ( NAME )
RETURNS TEXT AS $$
    SELECT has_pk( $1, 'Table ' || quote_ident($1) || ' should have a primary key' );
$$ LANGUAGE sql;

-- hasnt_pk( schema, table, description )
CREATE OR REPLACE FUNCTION hasnt_pk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _hasc( $1, $2, 'p' ), $3 );
$$ LANGUAGE sql;

-- hasnt_pk( table, description )
CREATE OR REPLACE FUNCTION hasnt_pk ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _hasc( $1, 'p' ), $2 );
$$ LANGUAGE sql;

-- hasnt_pk( table )
CREATE OR REPLACE FUNCTION hasnt_pk ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_pk( $1, 'Table ' || quote_ident($1) || ' should not have a primary key' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _ident_array_to_string( name[], text )
RETURNS text AS $$
    SELECT array_to_string(ARRAY(
        SELECT quote_ident($1[i])
          FROM generate_series(1, array_upper($1, 1)) s(i)
         ORDER BY i
    ), $2);
$$ LANGUAGE SQL immutable;

-- Borrowed from newsysviews: https://www.postgresql.org/ftp/projects/pgFoundry/newsysviews/
CREATE OR REPLACE FUNCTION _pg_sv_column_array( OID, SMALLINT[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT a.attname
          FROM pg_catalog.pg_attribute a
          JOIN generate_series(1, array_upper($2, 1)) s(i) ON a.attnum = $2[i]
         WHERE attrelid = $1
         ORDER BY i
    )
$$ LANGUAGE SQL stable;

-- Borrowed from newsysviews: https://www.postgresql.org/ftp/projects/pgFoundry/newsysviews/
CREATE OR REPLACE FUNCTION _pg_sv_table_accessible( OID, OID )
RETURNS BOOLEAN AS $$
    SELECT CASE WHEN has_schema_privilege($1, 'USAGE') THEN (
                  has_table_privilege($2, 'SELECT')
               OR has_table_privilege($2, 'INSERT')
               or has_table_privilege($2, 'UPDATE')
               OR has_table_privilege($2, 'DELETE')
               OR has_table_privilege($2, 'RULE')
               OR has_table_privilege($2, 'REFERENCES')
               OR has_table_privilege($2, 'TRIGGER')
           ) ELSE FALSE
    END;
$$ LANGUAGE SQL immutable strict;

-- Borrowed from newsysviews: https://www.postgresql.org/ftp/projects/pgFoundry/newsysviews/
CREATE OR REPLACE VIEW pg_all_foreign_keys
AS
  SELECT n1.nspname                                   AS fk_schema_name,
         c1.relname                                   AS fk_table_name,
         k1.conname                                   AS fk_constraint_name,
         c1.oid                                       AS fk_table_oid,
         _pg_sv_column_array(k1.conrelid,k1.conkey)   AS fk_columns,
         n2.nspname                                   AS pk_schema_name,
         c2.relname                                   AS pk_table_name,
         k2.conname                                   AS pk_constraint_name,
         c2.oid                                       AS pk_table_oid,
         ci.relname                                   AS pk_index_name,
         _pg_sv_column_array(k1.confrelid,k1.confkey) AS pk_columns,
         CASE k1.confmatchtype WHEN 'f' THEN 'FULL'
                               WHEN 'p' THEN 'PARTIAL'
                               WHEN 'u' THEN 'NONE'
                               else null
         END AS match_type,
         CASE k1.confdeltype WHEN 'a' THEN 'NO ACTION'
                             WHEN 'c' THEN 'CASCADE'
                             WHEN 'd' THEN 'SET DEFAULT'
                             WHEN 'n' THEN 'SET NULL'
                             WHEN 'r' THEN 'RESTRICT'
                             else null
         END AS on_delete,
         CASE k1.confupdtype WHEN 'a' THEN 'NO ACTION'
                             WHEN 'c' THEN 'CASCADE'
                             WHEN 'd' THEN 'SET DEFAULT'
                             WHEN 'n' THEN 'SET NULL'
                             WHEN 'r' THEN 'RESTRICT'
                             ELSE NULL
         END AS on_update,
         k1.condeferrable AS is_deferrable,
         k1.condeferred   AS is_deferred
    FROM pg_catalog.pg_constraint k1
    JOIN pg_catalog.pg_namespace n1 ON (n1.oid = k1.connamespace)
    JOIN pg_catalog.pg_class c1     ON (c1.oid = k1.conrelid)
    JOIN pg_catalog.pg_class c2     ON (c2.oid = k1.confrelid)
    JOIN pg_catalog.pg_namespace n2 ON (n2.oid = c2.relnamespace)
    JOIN pg_catalog.pg_depend d     ON (
                 d.classid = 'pg_constraint'::regclass
             AND d.objid = k1.oid
             AND d.objsubid = 0
             AND d.deptype = 'n'
             AND d.refclassid = 'pg_class'::regclass
             AND d.refobjsubid=0
         )
    JOIN pg_catalog.pg_class ci ON (ci.oid = d.refobjid AND ci.relkind = 'i')
    LEFT JOIN pg_depend d2      ON (
                 d2.classid = 'pg_class'::regclass
             AND d2.objid = ci.oid
             AND d2.objsubid = 0
             AND d2.deptype = 'i'
             AND d2.refclassid = 'pg_constraint'::regclass
             AND d2.refobjsubid = 0
         )
    LEFT JOIN pg_catalog.pg_constraint k2 ON (
                 k2.oid = d2.refobjid
             AND k2.contype IN ('p', 'u')
         )
   WHERE k1.conrelid != 0
     AND k1.confrelid != 0
     AND k1.contype = 'f'
     AND _pg_sv_table_accessible(n1.oid, c1.oid);

-- _keys( schema, table, constraint_type )
CREATE OR REPLACE FUNCTION _keys ( NAME, NAME, CHAR )
RETURNS SETOF NAME[] AS $$
    SELECT _pg_sv_column_array(x.conrelid,x.conkey) -- name[] doesn't support collation
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_class c       ON n.oid = c.relnamespace
      JOIN pg_catalog.pg_constraint x  ON c.oid = x.conrelid
     WHERE n.nspname = $1
       AND c.relname = $2
       AND x.contype = $3
  ORDER BY 1
$$ LANGUAGE sql;

-- _keys( table, constraint_type )
CREATE OR REPLACE FUNCTION _keys ( NAME, CHAR )
RETURNS SETOF NAME[] AS $$
    SELECT _pg_sv_column_array(x.conrelid,x.conkey) -- name[] doesn't support collation
      FROM pg_catalog.pg_class c
      JOIN pg_catalog.pg_constraint x  ON c.oid = x.conrelid
       AND c.relname = $1
       AND x.contype = $2
     WHERE pg_catalog.pg_table_is_visible(c.oid)
  ORDER BY 1
$$ LANGUAGE sql;

-- _ckeys( schema, table, constraint_type )
CREATE OR REPLACE FUNCTION _ckeys ( NAME, NAME, CHAR )
RETURNS NAME[] AS $$
    SELECT * FROM _keys($1, $2, $3) LIMIT 1;
$$ LANGUAGE sql;

-- _ckeys( table, constraint_type )
CREATE OR REPLACE FUNCTION _ckeys ( NAME, CHAR )
RETURNS NAME[] AS $$
    SELECT * FROM _keys($1, $2) LIMIT 1;
$$ LANGUAGE sql;

-- col_is_pk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT is( _ckeys( $1, $2, 'p' ), $3, $4 );
$$ LANGUAGE sql;

-- col_is_pk( table, column, description )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT is( _ckeys( $1, 'p' ), $2, $3 );
$$ LANGUAGE sql;

-- col_is_pk( table, column[] )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_is_pk( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should be a primary key' );
$$ LANGUAGE sql;

-- col_is_pk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_pk( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_is_pk( table, column, description )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_pk( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_is_pk( table, column )
CREATE OR REPLACE FUNCTION col_is_pk ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_is_pk( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should be a primary key' );
$$ LANGUAGE sql;

-- col_isnt_pk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT isnt( _ckeys( $1, $2, 'p' ), $3, $4 );
$$ LANGUAGE sql;

-- col_isnt_pk( table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT isnt( _ckeys( $1, 'p' ), $2, $3 );
$$ LANGUAGE sql;

-- col_isnt_pk( table, column[] )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_isnt_pk( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should not be a primary key' );
$$ LANGUAGE sql;

-- col_isnt_pk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_isnt_pk( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_isnt_pk( table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_isnt_pk( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_isnt_pk( table, column )
CREATE OR REPLACE FUNCTION col_isnt_pk ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_isnt_pk( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should not be a primary key' );
$$ LANGUAGE sql;

-- has_fk( schema, table, description )
CREATE OR REPLACE FUNCTION has_fk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, $2, 'f' ), $3 );
$$ LANGUAGE sql;

-- has_fk( table, description )
CREATE OR REPLACE FUNCTION has_fk ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, 'f' ), $2 );
$$ LANGUAGE sql;

-- has_fk( table )
CREATE OR REPLACE FUNCTION has_fk ( NAME )
RETURNS TEXT AS $$
    SELECT has_fk( $1, 'Table ' || quote_ident($1) || ' should have a foreign key constraint' );
$$ LANGUAGE sql;

-- hasnt_fk( schema, table, description )
CREATE OR REPLACE FUNCTION hasnt_fk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _hasc( $1, $2, 'f' ), $3 );
$$ LANGUAGE sql;

-- hasnt_fk( table, description )
CREATE OR REPLACE FUNCTION hasnt_fk ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _hasc( $1, 'f' ), $2 );
$$ LANGUAGE sql;

-- hasnt_fk( table )
CREATE OR REPLACE FUNCTION hasnt_fk ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_fk( $1, 'Table ' || quote_ident($1) || ' should not have a foreign key constraint' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _fkexists ( NAME, NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT TRUE
           FROM pg_all_foreign_keys
          WHERE fk_schema_name    = $1
            AND quote_ident(fk_table_name)     = quote_ident($2)
            AND fk_columns = $3
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _fkexists ( NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT TRUE
           FROM pg_all_foreign_keys
          WHERE quote_ident(fk_table_name)     = quote_ident($1)
            AND pg_catalog.pg_table_is_visible(fk_table_oid)
            AND fk_columns = $2
    );
$$ LANGUAGE SQL;

-- col_is_fk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    names text[];
BEGIN
    IF _fkexists($1, $2, $3) THEN
        RETURN pass( $4 );
    END IF;

    -- Try to show the columns.
    SELECT ARRAY(
        SELECT _ident_array_to_string(fk_columns, ', ')
          FROM pg_all_foreign_keys
         WHERE fk_schema_name = $1
           AND fk_table_name  = $2
         ORDER BY fk_columns
    ) INTO names;

    IF names[1] IS NOT NULL THEN
        RETURN fail($4) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || E' has foreign key constraints on these columns:\n        '
            ||  array_to_string( names, E'\n        ' )
        );
    END IF;

    -- No FKs in this table.
    RETURN fail($4) || E'\n' || diag(
        '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' has no foreign key columns'
    );
END;
$$ LANGUAGE plpgsql;

-- col_is_fk( table, column, description )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    names text[];
BEGIN
    IF _fkexists($1, $2) THEN
        RETURN pass( $3 );
    END IF;

    -- Try to show the columns.
    SELECT ARRAY(
        SELECT _ident_array_to_string(fk_columns, ', ')
          FROM pg_all_foreign_keys
         WHERE fk_table_name  = $1
         ORDER BY fk_columns
    ) INTO names;

    IF NAMES[1] IS NOT NULL THEN
        RETURN fail($3) || E'\n' || diag(
            '    Table ' || quote_ident($1) || E' has foreign key constraints on these columns:\n        '
            || array_to_string( names, E'\n        ' )
        );
    END IF;

    -- No FKs in this table.
    RETURN fail($3) || E'\n' || diag(
        '    Table ' || quote_ident($1) || ' has no foreign key columns'
    );
END;
$$ LANGUAGE plpgsql;

-- col_is_fk( table, column[] )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_is_fk( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should be a foreign key' );
$$ LANGUAGE sql;

-- col_is_fk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_fk( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_is_fk( table, column, description )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_fk( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_is_fk( table, column )
CREATE OR REPLACE FUNCTION col_is_fk ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_is_fk( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should be a foreign key' );
$$ LANGUAGE sql;

-- col_isnt_fk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _fkexists( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- col_isnt_fk( table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _fkexists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- col_isnt_fk( table, column[] )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_isnt_fk( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should not be a foreign key' );
$$ LANGUAGE sql;

-- col_isnt_fk( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_isnt_fk( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_isnt_fk( table, column, description )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_isnt_fk( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_isnt_fk( table, column )
CREATE OR REPLACE FUNCTION col_isnt_fk ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_isnt_fk( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should not be a foreign key' );
$$ LANGUAGE sql;

-- has_unique( schema, table, description )
CREATE OR REPLACE FUNCTION has_unique ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, $2, 'u' ), $3 );
$$ LANGUAGE sql;

-- has_unique( table, description )
CREATE OR REPLACE FUNCTION has_unique ( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, 'u' ), $2 );
$$ LANGUAGE sql;

-- has_unique( table )
CREATE OR REPLACE FUNCTION has_unique ( TEXT )
RETURNS TEXT AS $$
    SELECT has_unique( $1, 'Table ' || quote_ident($1) || ' should have a unique constraint' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _constraint ( NAME, NAME, CHAR, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    akey NAME[];
    keys TEXT[] := '{}';
    have TEXT;
BEGIN
    FOR akey IN SELECT * FROM _keys($1, $2, $3) LOOP
        IF akey = $4 THEN RETURN pass($5); END IF;
        keys = keys || akey::text;
    END LOOP;
    IF array_upper(keys, 0) = 1 THEN
        have := 'No ' || $6 || ' constraints';
    ELSE
        have := array_to_string(keys, E'\n              ');
    END IF;

    RETURN fail($5) || E'\n' || diag(
             '        have: ' || have
       || E'\n        want: ' || CASE WHEN $4 IS NULL THEN 'NULL' ELSE $4::text END
    );
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _constraint ( NAME, CHAR, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    akey NAME[];
    keys TEXT[] := '{}';
    have TEXT;
BEGIN
    FOR akey IN SELECT * FROM _keys($1, $2) LOOP
        IF akey = $3 THEN RETURN pass($4); END IF;
        keys = keys || akey::text;
    END LOOP;
    IF array_upper(keys, 0) = 1 THEN
        have := 'No ' || $5 || ' constraints';
    ELSE
        have := array_to_string(keys, E'\n              ');
    END IF;

    RETURN fail($4) || E'\n' || diag(
             '        have: ' || have
       || E'\n        want: ' || CASE WHEN $3 IS NULL THEN 'NULL' ELSE $3::text END
    );
END;
$$ LANGUAGE plpgsql;

-- col_is_unique( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _constraint( $1, $2, 'u', $3, $4, 'unique' );
$$ LANGUAGE sql;

-- col_is_unique( schema, table, column[] )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, $2, $3, 'Columns ' || quote_ident($2) || '(' || _ident_array_to_string($3, ', ') || ') should have a unique constraint' );
$$ LANGUAGE sql;

-- col_is_unique( scheam, table, column )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, $2, ARRAY[$3], 'Column ' || quote_ident($2) || '(' || quote_ident($3) || ') should have a unique constraint' );
$$ LANGUAGE sql;

-- col_is_unique( table, column, description )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _constraint( $1, 'u', $2, $3, 'unique' );
$$ LANGUAGE sql;

-- col_is_unique( table, column[] )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should have a unique constraint' );
$$ LANGUAGE sql;

-- col_is_unique( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_is_unique( table, column, description )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_is_unique( table, column )
CREATE OR REPLACE FUNCTION col_is_unique ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_is_unique( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should have a unique constraint' );
$$ LANGUAGE sql;

-- has_check( schema, table, description )
CREATE OR REPLACE FUNCTION has_check ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, $2, 'c' ), $3 );
$$ LANGUAGE sql;

-- has_check( table, description )
CREATE OR REPLACE FUNCTION has_check ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _hasc( $1, 'c' ), $2 );
$$ LANGUAGE sql;

-- has_check( table )
CREATE OR REPLACE FUNCTION has_check ( NAME )
RETURNS TEXT AS $$
    SELECT has_check( $1, 'Table ' || quote_ident($1) || ' should have a check constraint' );
$$ LANGUAGE sql;

-- col_has_check( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _constraint( $1, $2, 'c', $3, $4, 'check' );
$$ LANGUAGE sql;

-- col_has_check( table, column, description )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _constraint( $1, 'c', $2, $3, 'check' );
$$ LANGUAGE sql;

-- col_has_check( table, column[] )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT col_has_check( $1, $2, 'Columns ' || quote_ident($1) || '(' || _ident_array_to_string($2, ', ') || ') should have a check constraint' );
$$ LANGUAGE sql;

-- col_has_check( schema, table, column, description )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_has_check( $1, $2, ARRAY[$3], $4 );
$$ LANGUAGE sql;

-- col_has_check( table, column, description )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT col_has_check( $1, ARRAY[$2], $3 );
$$ LANGUAGE sql;

-- col_has_check( table, column )
CREATE OR REPLACE FUNCTION col_has_check ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT col_has_check( $1, $2, 'Column ' || quote_ident($1) || '(' || quote_ident($2) || ') should have a check constraint' );
$$ LANGUAGE sql;

-- fk_ok( fk_schema, fk_table, fk_column[], pk_schema, pk_table, pk_column[], description )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME[], NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    sch  name;
    tab  name;
    cols name[];
BEGIN
    SELECT pk_schema_name, pk_table_name, pk_columns
      FROM pg_all_foreign_keys
      WHERE fk_schema_name = $1
        AND fk_table_name  = $2
        AND fk_columns     = $3
      INTO sch, tab, cols;

    RETURN is(
        -- have
        quote_ident($1) || '.' || quote_ident($2) || '(' || _ident_array_to_string( $3, ', ' )
        || ') REFERENCES ' || COALESCE ( sch || '.' || tab || '(' || _ident_array_to_string( cols, ', ' ) || ')', 'NOTHING' ),
        -- want
        quote_ident($1) || '.' || quote_ident($2) || '(' || _ident_array_to_string( $3, ', ' )
        || ') REFERENCES ' ||
        $4 || '.' || $5 || '(' || _ident_array_to_string( $6, ', ' ) || ')',
        $7
    );
END;
$$ LANGUAGE plpgsql;

-- fk_ok( fk_table, fk_column[], pk_table, pk_column[], description )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME[], NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    tab  name;
    cols name[];
BEGIN
    SELECT pk_table_name, pk_columns
      FROM pg_all_foreign_keys
     WHERE fk_table_name = $1
       AND fk_columns    = $2
       AND pg_catalog.pg_table_is_visible(fk_table_oid)
      INTO tab, cols;

    RETURN is(
        -- have
        $1 || '(' || _ident_array_to_string( $2, ', ' )
        || ') REFERENCES ' || COALESCE( tab || '(' || _ident_array_to_string( cols, ', ' ) || ')', 'NOTHING'),
        -- want
        $1 || '(' || _ident_array_to_string( $2, ', ' )
        || ') REFERENCES ' ||
        $3 || '(' || _ident_array_to_string( $4, ', ' ) || ')',
        $5
    );
END;
$$ LANGUAGE plpgsql;

-- fk_ok( fk_schema, fk_table, fk_column[], fk_schema, pk_table, pk_column[] )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME[], NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, $2, $3, $4, $5, $6,
        quote_ident($1) || '.' || quote_ident($2) || '(' || _ident_array_to_string( $3, ', ' )
        || ') should reference ' ||
        $4 || '.' || $5 || '(' || _ident_array_to_string( $6, ', ' ) || ')'
    );
$$ LANGUAGE sql;

-- fk_ok( fk_table, fk_column[], pk_table, pk_column[] )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME[], NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, $2, $3, $4,
        $1 || '(' || _ident_array_to_string( $2, ', ' )
        || ') should reference ' ||
        $3 || '(' || _ident_array_to_string( $4, ', ' ) || ')'
    );
$$ LANGUAGE sql;

-- fk_ok( fk_schema, fk_table, fk_column, pk_schema, pk_table, pk_column, description )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, $2, ARRAY[$3], $4, $5, ARRAY[$6], $7 );
$$ LANGUAGE sql;

-- fk_ok( fk_schema, fk_table, fk_column, pk_schema, pk_table, pk_column )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, $2, ARRAY[$3], $4, $5, ARRAY[$6] );
$$ LANGUAGE sql;

-- fk_ok( fk_table, fk_column, pk_table, pk_column, description )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, ARRAY[$2], $3, ARRAY[$4], $5 );
$$ LANGUAGE sql;

-- fk_ok( fk_table, fk_column, pk_table, pk_column )
CREATE OR REPLACE FUNCTION fk_ok ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT fk_ok( $1, ARRAY[$2], $3, ARRAY[$4] );
$$ LANGUAGE sql;

/*
 * tap_funky used to just be a simple view, but the problem with that is the
 * definition of pg_proc changed in version 11. Thanks to how pg_dump (and
 * hence pg_upgrade) works, this made it impossible to upgrade Postgres if
 * pgTap was installed. In order to fix that, we need code that will actually
 * work on both < PG11 and >= PG11.
 */
CREATE OR REPLACE FUNCTION _prokind( p_oid oid )
RETURNS "char" AS $$
BEGIN
    IF pg_version_num() >= 110000 THEN
        RETURN prokind FROM pg_catalog.pg_proc WHERE oid = p_oid;
    ELSE
        RETURN CASE proisagg WHEN true THEN 'a' WHEN false THEN 'f' END
            FROM pg_catalog.pg_proc WHERE oid = p_oid;
    END IF;
END;
$$ LANGUAGE plpgsql STABLE;


CREATE OR REPLACE VIEW tap_funky
 AS SELECT p.oid         AS oid,
           n.nspname     AS schema,
           p.proname     AS name,
           pg_catalog.pg_get_userbyid(p.proowner) AS owner,
           array_to_string(p.proargtypes::regtype[], ',') AS args,
           CASE p.proretset WHEN TRUE THEN 'setof ' ELSE '' END
             || p.prorettype::regtype AS returns,
           p.prolang     AS langoid,
           p.proisstrict AS is_strict,
           _prokind(p.oid) AS kind,
           p.prosecdef   AS is_definer,
           p.proretset   AS returns_set,
           p.provolatile::char AS volatility,
           pg_catalog.pg_function_is_visible(p.oid) AS is_visible
      FROM pg_catalog.pg_proc p
      JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid
;

CREATE OR REPLACE FUNCTION _funkargs ( NAME[] )
RETURNS TEXT AS $$
BEGIN
    RETURN array_to_string($1::regtype[], ',');
EXCEPTION WHEN undefined_object THEN
    RETURN array_to_string($1, ',');
END;
$$ LANGUAGE PLPGSQL STABLE;

CREATE OR REPLACE FUNCTION _got_func ( NAME, NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT TRUE
          FROM tap_funky
         WHERE schema = $1
           AND name   = $2
           AND args = _funkargs($3)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _got_func ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS( SELECT TRUE FROM tap_funky WHERE schema = $1 AND name = $2 );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _got_func ( NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT TRUE
          FROM tap_funky
         WHERE name = $1
           AND args = _funkargs($2)
           AND is_visible
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _got_func ( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS( SELECT TRUE FROM tap_funky WHERE name = $1 AND is_visible);
$$ LANGUAGE SQL;

-- has_function( schema, function, args[], description )
CREATE OR REPLACE FUNCTION has_function ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( _got_func($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- has_function( schema, function, args[] )
CREATE OR REPLACE FUNCTION has_function( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _got_func($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should exist'
    );
$$ LANGUAGE sql;

-- has_function( schema, function, description )
CREATE OR REPLACE FUNCTION has_function ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _got_func($1, $2), $3 );
$$ LANGUAGE SQL;

-- has_function( schema, function )
CREATE OR REPLACE FUNCTION has_function( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _got_func($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should exist'
    );
$$ LANGUAGE sql;

-- has_function( function, args[], description )
CREATE OR REPLACE FUNCTION has_function ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( _got_func($1, $2), $3 );
$$ LANGUAGE SQL;

-- has_function( function, args[] )
CREATE OR REPLACE FUNCTION has_function( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _got_func($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should exist'
    );
$$ LANGUAGE sql;

-- has_function( function, description )
CREATE OR REPLACE FUNCTION has_function( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _got_func($1), $2 );
$$ LANGUAGE sql;

-- has_function( function )
CREATE OR REPLACE FUNCTION has_function( NAME )
RETURNS TEXT AS $$
    SELECT ok( _got_func($1), 'Function ' || quote_ident($1) || '() should exist' );
$$ LANGUAGE sql;

-- hasnt_function( schema, function, args[], description )
CREATE OR REPLACE FUNCTION hasnt_function ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _got_func($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- hasnt_function( schema, function, args[] )
CREATE OR REPLACE FUNCTION hasnt_function( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _got_func($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should not exist'
    );
$$ LANGUAGE sql;

-- hasnt_function( schema, function, description )
CREATE OR REPLACE FUNCTION hasnt_function ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _got_func($1, $2), $3 );
$$ LANGUAGE SQL;

-- hasnt_function( schema, function )
CREATE OR REPLACE FUNCTION hasnt_function( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _got_func($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should not exist'
    );
$$ LANGUAGE sql;

-- hasnt_function( function, args[], description )
CREATE OR REPLACE FUNCTION hasnt_function ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _got_func($1, $2), $3 );
$$ LANGUAGE SQL;

-- hasnt_function( function, args[] )
CREATE OR REPLACE FUNCTION hasnt_function( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _got_func($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should not exist'
    );
$$ LANGUAGE sql;

-- hasnt_function( function, description )
CREATE OR REPLACE FUNCTION hasnt_function( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _got_func($1), $2 );
$$ LANGUAGE sql;

-- hasnt_function( function )
CREATE OR REPLACE FUNCTION hasnt_function( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _got_func($1), 'Function ' || quote_ident($1) || '() should not exist' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _pg_sv_type_array( OID[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT t.typname
          FROM pg_catalog.pg_type t
          JOIN generate_series(1, array_upper($1, 1)) s(i) ON t.oid = $1[i]
         ORDER BY i
    )
$$ LANGUAGE SQL stable;

-- can( schema, functions[], description )
CREATE OR REPLACE FUNCTION can ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    missing text[];
BEGIN
    SELECT ARRAY(
        SELECT quote_ident($2[i])
          FROM generate_series(1, array_upper($2, 1)) s(i)
          LEFT JOIN tap_funky ON name = $2[i] AND schema = $1
         WHERE oid IS NULL
         GROUP BY $2[i], s.i
         ORDER BY MIN(s.i)
    ) INTO missing;
    IF missing[1] IS NULL THEN
        RETURN ok( true, $3 );
    END IF;
    RETURN ok( false, $3 ) || E'\n' || diag(
        '    ' || quote_ident($1) || '.' ||
        array_to_string( missing, E'() missing\n    ' || quote_ident($1) || '.') ||
        '() missing'
    );
END;
$$ LANGUAGE plpgsql;

-- can( schema, functions[] )
CREATE OR REPLACE FUNCTION can ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT can( $1, $2, 'Schema ' || quote_ident($1) || ' can' );
$$ LANGUAGE sql;

-- can( functions[], description )
CREATE OR REPLACE FUNCTION can ( NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    missing text[];
BEGIN
    SELECT ARRAY(
        SELECT quote_ident($1[i])
          FROM generate_series(1, array_upper($1, 1)) s(i)
          LEFT JOIN pg_catalog.pg_proc p
            ON $1[i] = p.proname
           AND pg_catalog.pg_function_is_visible(p.oid)
         WHERE p.oid IS NULL
         ORDER BY s.i
    ) INTO missing;
    IF missing[1] IS NULL THEN
        RETURN ok( true, $2 );
    END IF;
    RETURN ok( false, $2 ) || E'\n' || diag(
        '    ' ||
        array_to_string( missing, E'() missing\n    ') ||
        '() missing'
    );
END;
$$ LANGUAGE plpgsql;

-- can( functions[] )
CREATE OR REPLACE FUNCTION can ( NAME[] )
RETURNS TEXT AS $$
    SELECT can( $1, 'Schema ' || _ident_array_to_string(current_schemas(true), ' or ') || ' can' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _ikeys( NAME, NAME, NAME)
RETURNS TEXT[] AS $$
    SELECT ARRAY(
        SELECT pg_catalog.pg_get_indexdef( ci.oid, s.i + 1, false)
          FROM pg_catalog.pg_index x
          JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
          JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
          JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
          JOIN generate_series(0, current_setting('max_index_keys')::int - 1) s(i)
            ON x.indkey[s.i] IS NOT NULL
         WHERE ct.relname = $2
           AND ci.relname = $3
           AND n.nspname  = $1
         ORDER BY s.i
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _ikeys( NAME, NAME)
RETURNS TEXT[] AS $$
    SELECT ARRAY(
        SELECT pg_catalog.pg_get_indexdef( ci.oid, s.i + 1, false)
          FROM pg_catalog.pg_index x
          JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
          JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
          JOIN generate_series(0, current_setting('max_index_keys')::int - 1) s(i)
            ON x.indkey[s.i] IS NOT NULL
         WHERE ct.relname = $1
           AND ci.relname = $2
           AND pg_catalog.pg_table_is_visible(ct.oid)
         ORDER BY s.i
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _have_index( NAME, NAME, NAME)
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
    SELECT TRUE
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
     WHERE n.nspname  = $1
       AND ct.relname = $2
       AND ci.relname = $3
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _have_index( NAME, NAME)
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
    SELECT TRUE
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
     WHERE ct.relname = $1
       AND ci.relname = $2
       AND pg_catalog.pg_table_is_visible(ct.oid)
    );
$$ LANGUAGE sql;

-- has_index( schema, table, index, columns[], description )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME, NAME[], text )
RETURNS TEXT AS $$
DECLARE
     index_cols name[];
BEGIN
    index_cols := _ikeys($1, $2, $3 );

    IF index_cols IS NULL OR index_cols = '{}'::name[] THEN
        RETURN ok( false, $5 ) || E'\n'
            || diag( 'Index ' || quote_ident($3) || ' ON ' || quote_ident($1) || '.' || quote_ident($2) || ' not found');
    END IF;

    RETURN is(
        quote_ident($3) || ' ON ' || quote_ident($1) || '.' || quote_ident($2) || '(' || array_to_string( index_cols, ', ' ) || ')',
        quote_ident($3) || ' ON ' || quote_ident($1) || '.' || quote_ident($2) || '(' || array_to_string( $4, ', ' ) || ')',
        $5
    );
END;
$$ LANGUAGE plpgsql;

-- has_index( schema, table, index, columns[] )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
   SELECT has_index( $1, $2, $3, $4, 'Index ' || quote_ident($3) || ' should exist' );
$$ LANGUAGE sql;

-- has_index( schema, table, index, column, description )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT has_index( $1, $2, $3, ARRAY[$4], $5 );
$$ LANGUAGE sql;

-- has_index( schema, table, index, column )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
   SELECT has_index( $1, $2, $3, $4, 'Index ' || quote_ident($3) || ' should exist' );
$$ LANGUAGE sql;

-- has_index( table, index, columns[], description )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME[], text )
RETURNS TEXT AS $$
DECLARE
     index_cols name[];
BEGIN
    index_cols := _ikeys($1, $2 );

    IF index_cols IS NULL OR index_cols = '{}'::name[] THEN
        RETURN ok( false, $4 ) || E'\n'
            || diag( 'Index ' || quote_ident($2) || ' ON ' || quote_ident($1) || ' not found');
    END IF;

    RETURN is(
        quote_ident($2) || ' ON ' || quote_ident($1) || '(' || array_to_string( index_cols, ', ' ) || ')',
        quote_ident($2) || ' ON ' || quote_ident($1) || '(' || array_to_string( $3, ', ' ) || ')',
        $4
    );
END;
$$ LANGUAGE plpgsql;

-- has_index( table, index, columns[] )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
   SELECT has_index( $1, $2, $3, 'Index ' || quote_ident($2) || ' should exist' );
$$ LANGUAGE sql;

-- _is_schema( schema )
CREATE OR REPLACE FUNCTION _is_schema( NAME )
returns boolean AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace
          WHERE nspname = $1
    );
$$ LANGUAGE sql;

-- has_index( table, index, column/expression, description )
-- has_index( schema, table, index, column/expression )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT CASE WHEN _is_schema( $1 ) THEN
        -- Looking for schema.table index.
            ok ( _have_index( $1, $2, $3 ), $4)
        ELSE
        -- Looking for particular columns.
            has_index( $1, $2, ARRAY[$3], $4 )
      END;
$$ LANGUAGE sql;

-- has_index( table, index, column/expression )
-- has_index( schema, table, index )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, NAME )
RETURNS TEXT AS $$
BEGIN
   IF _is_schema($1) THEN
       -- ( schema, table, index )
       RETURN ok( _have_index( $1, $2, $3 ), 'Index ' || quote_ident($3) || ' should exist' );
   ELSE
       -- ( table, index, column/expression )
       RETURN has_index( $1, $2, $3, 'Index ' || quote_ident($2) || ' should exist' );
   END IF;
END;
$$ LANGUAGE plpgsql;

-- has_index( table, index, description )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT CASE WHEN $3 LIKE '%(%'
           THEN has_index( $1, $2, $3::name )
           ELSE ok( _have_index( $1, $2 ), $3 )
           END;
$$ LANGUAGE sql;

-- has_index( table, index )
CREATE OR REPLACE FUNCTION has_index ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _have_index( $1, $2 ), 'Index ' || quote_ident($2) || ' should exist' );
$$ LANGUAGE sql;

-- hasnt_index( schema, table, index, description )
CREATE OR REPLACE FUNCTION hasnt_index ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
BEGIN
    RETURN ok( NOT _have_index( $1, $2, $3 ), $4 );
END;
$$ LANGUAGE plpgSQL;

-- hasnt_index( schema, table, index )
CREATE OR REPLACE FUNCTION hasnt_index ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _have_index( $1, $2, $3 ),
        'Index ' || quote_ident($3) || ' should not exist'
    );
$$ LANGUAGE SQL;

-- hasnt_index( table, index, description )
CREATE OR REPLACE FUNCTION hasnt_index ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _have_index( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_index( table, index )
CREATE OR REPLACE FUNCTION hasnt_index ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _have_index( $1, $2 ),
        'Index ' || quote_ident($2) || ' should not exist'
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _is_indexed( NAME, NAME, TEXT[] )
RETURNS BOOL AS $$
SELECT EXISTS( SELECT TRUE FROM (
        SELECT _ikeys(coalesce($1, n.nspname), $2, ci.relname) AS cols
          FROM pg_catalog.pg_index x
          JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
          JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
          JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
         WHERE ($1 IS NULL OR n.nspname  = $1)
           AND ct.relname = $2
    ) icols
    WHERE cols = $3 )
$$ LANGUAGE sql;

-- is_indexed( schema, table, columns[], description )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
   SELECT ok( _is_indexed($1, $2, $3), $4 );
$$ LANGUAGE sql;

-- is_indexed( schema, table, columns[] )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
   SELECT ok(
       _is_indexed($1, $2, $3),
       'Should have an index on ' ||  quote_ident($1) || '.' || quote_ident($2) || '(' || array_to_string( $3, ', ' ) || ')'
    );
$$ LANGUAGE sql;

-- is_indexed( table, columns[], description )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
   SELECT ok( _is_indexed(NULL, $1, $2), $3 );
$$ LANGUAGE sql;

-- is_indexed( table, columns[] )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME[] )
RETURNS TEXT AS $$
   SELECT ok(
       _is_indexed(NULL, $1, $2),
       'Should have an index on ' ||  quote_ident($1) || '(' || array_to_string( $2, ', ' ) || ')'
   );
$$ LANGUAGE sql;

-- is_indexed( schema, table, column, description )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
   SELECT ok ( _is_indexed( $1, $2, ARRAY[$3]::NAME[]), $4);
$$ LANGUAGE sql;

-- is_indexed( schema, table, column )
-- is_indexed( table, column, description )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT CASE WHEN _is_schema( $1 ) THEN
                -- Looking for schema.table index.
                is_indexed( $1, $2, ARRAY[$3]::NAME[] )
           ELSE
                -- Looking for particular columns.
                is_indexed( $1, ARRAY[$2]::NAME[], $3 )
           END;
$$ LANGUAGE sql;

-- is_indexed( table, column )
CREATE OR REPLACE FUNCTION is_indexed ( NAME, NAME )
RETURNS TEXT AS $$
   SELECT ok ( _is_indexed( NULL, $1, ARRAY[$2]::NAME[]) );
$$ LANGUAGE sql;

-- index_is_unique( schema, table, index, description )
CREATE OR REPLACE FUNCTION index_is_unique ( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisunique
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
     WHERE ct.relname = $2
       AND ci.relname = $3
       AND n.nspname  = $1
      INTO res;

      RETURN ok( COALESCE(res, false), $4 );
END;
$$ LANGUAGE plpgsql;

-- index_is_unique( schema, table, index )
CREATE OR REPLACE FUNCTION index_is_unique ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT index_is_unique(
        $1, $2, $3,
        'Index ' || quote_ident($3) || ' should be unique'
    );
$$ LANGUAGE sql;

-- index_is_unique( table, index )
CREATE OR REPLACE FUNCTION index_is_unique ( NAME, NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisunique
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
     WHERE ct.relname = $1
       AND ci.relname = $2
       AND pg_catalog.pg_table_is_visible(ct.oid)
      INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Index ' || quote_ident($2) || ' should be unique'
      );
END;
$$ LANGUAGE plpgsql;

-- index_is_unique( index )
CREATE OR REPLACE FUNCTION index_is_unique ( NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisunique
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
     WHERE ci.relname = $1
       AND pg_catalog.pg_table_is_visible(ct.oid)
      INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Index ' || quote_ident($1) || ' should be unique'
      );
END;
$$ LANGUAGE plpgsql;

-- index_is_primary( schema, table, index, description )
CREATE OR REPLACE FUNCTION index_is_primary ( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisprimary
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
     WHERE ct.relname = $2
       AND ci.relname = $3
       AND n.nspname  = $1
      INTO res;

      RETURN ok( COALESCE(res, false), $4 );
END;
$$ LANGUAGE plpgsql;

-- index_is_primary( schema, table, index )
CREATE OR REPLACE FUNCTION index_is_primary ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT index_is_primary(
        $1, $2, $3,
        'Index ' || quote_ident($3) || ' should be on a primary key'
    );
$$ LANGUAGE sql;

-- index_is_primary( table, index )
CREATE OR REPLACE FUNCTION index_is_primary ( NAME, NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisprimary
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
     WHERE ct.relname = $1
       AND ci.relname = $2
       AND pg_catalog.pg_table_is_visible(ct.oid)
     INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Index ' || quote_ident($2) || ' should be on a primary key'
      );
END;
$$ LANGUAGE plpgsql;

-- index_is_primary( index )
CREATE OR REPLACE FUNCTION index_is_primary ( NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisprimary
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
     WHERE ci.relname = $1
       AND pg_catalog.pg_table_is_visible(ct.oid)
      INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Index ' || quote_ident($1) || ' should be on a primary key'
      );
END;
$$ LANGUAGE plpgsql;

-- is_clustered( schema, table, index, description )
CREATE OR REPLACE FUNCTION is_clustered ( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisclustered
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
     WHERE ct.relname = $2
       AND ci.relname = $3
       AND n.nspname  = $1
      INTO res;

      RETURN ok( COALESCE(res, false), $4 );
END;
$$ LANGUAGE plpgsql;

-- is_clustered( schema, table, index )
CREATE OR REPLACE FUNCTION is_clustered ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT is_clustered(
        $1, $2, $3,
        'Table ' || quote_ident($1) || '.' || quote_ident($2) ||
        ' should be clustered on index ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- is_clustered( table, index )
CREATE OR REPLACE FUNCTION is_clustered ( NAME, NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisclustered
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
     WHERE ct.relname = $1
       AND ci.relname = $2
      INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Table ' || quote_ident($1) || ' should be clustered on index ' || quote_ident($2)
      );
END;
$$ LANGUAGE plpgsql;

-- is_clustered( index )
CREATE OR REPLACE FUNCTION is_clustered ( NAME )
RETURNS TEXT AS $$
DECLARE
    res boolean;
BEGIN
    SELECT x.indisclustered
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
     WHERE ci.relname = $1
      INTO res;

      RETURN ok(
          COALESCE(res, false),
          'Table should be clustered on index ' || quote_ident($1)
      );
END;
$$ LANGUAGE plpgsql;

-- index_is_type( schema, table, index, type, description )
CREATE OR REPLACE FUNCTION index_is_type ( NAME, NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    aname name;
BEGIN
    SELECT am.amname
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
      JOIN pg_catalog.pg_am am       ON ci.relam = am.oid
     WHERE ct.relname = $2
       AND ci.relname = $3
       AND n.nspname  = $1
      INTO aname;

      return is( aname, $4, $5 );
END;
$$ LANGUAGE plpgsql;

-- index_is_type( schema, table, index, type )
CREATE OR REPLACE FUNCTION index_is_type ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT index_is_type(
        $1, $2, $3, $4,
        'Index ' || quote_ident($3) || ' should be a ' || quote_ident($4) || ' index'
    );
$$ LANGUAGE SQL;

-- index_is_type( table, index, type )
CREATE OR REPLACE FUNCTION index_is_type ( NAME, NAME, NAME )
RETURNS TEXT AS $$
DECLARE
    aname name;
BEGIN
    SELECT am.amname
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_am am    ON ci.relam = am.oid
     WHERE ct.relname = $1
       AND ci.relname = $2
      INTO aname;

      return is(
          aname, $3,
          'Index ' || quote_ident($2) || ' should be a ' || quote_ident($3) || ' index'
      );
END;
$$ LANGUAGE plpgsql;

-- index_is_type( index, type )
CREATE OR REPLACE FUNCTION index_is_type ( NAME, NAME )
RETURNS TEXT AS $$
DECLARE
    aname name;
BEGIN
    SELECT am.amname
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_am am    ON ci.relam = am.oid
     WHERE ci.relname = $1
      INTO aname;

      return is(
          aname, $2,
          'Index ' || quote_ident($1) || ' should be a ' || quote_ident($2) || ' index'
      );
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _trig ( NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_trigger t
          JOIN pg_catalog.pg_class c     ON c.oid = t.tgrelid
          JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
         WHERE n.nspname = $1
           AND c.relname = $2
           AND t.tgname  = $3
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _trig ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_trigger t
          JOIN pg_catalog.pg_class c     ON c.oid = t.tgrelid
         WHERE c.relname = $1
           AND t.tgname  = $2
           AND pg_catalog.pg_table_is_visible(c.oid)
    );
$$ LANGUAGE SQL;

-- has_trigger( schema, table, trigger, description )
CREATE OR REPLACE FUNCTION has_trigger ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _trig($1, $2, $3), $4);
$$ LANGUAGE SQL;

-- has_trigger( schema, table, trigger )
CREATE OR REPLACE FUNCTION has_trigger ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_trigger(
        $1, $2, $3,
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have trigger ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- has_trigger( table, trigger, description )
CREATE OR REPLACE FUNCTION has_trigger ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _trig($1, $2), $3);
$$ LANGUAGE sql;

-- has_trigger( table, trigger )
CREATE OR REPLACE FUNCTION has_trigger ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _trig($1, $2), 'Table ' || quote_ident($1) || ' should have trigger ' || quote_ident($2));
$$ LANGUAGE SQL;

-- hasnt_trigger( schema, table, trigger, description )
CREATE OR REPLACE FUNCTION hasnt_trigger ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _trig($1, $2, $3), $4);
$$ LANGUAGE SQL;

-- hasnt_trigger( schema, table, trigger )
CREATE OR REPLACE FUNCTION hasnt_trigger ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _trig($1, $2, $3),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should not have trigger ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- hasnt_trigger( table, trigger, description )
CREATE OR REPLACE FUNCTION hasnt_trigger ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _trig($1, $2), $3);
$$ LANGUAGE sql;

-- hasnt_trigger( table, trigger )
CREATE OR REPLACE FUNCTION hasnt_trigger ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _trig($1, $2), 'Table ' || quote_ident($1) || ' should not have trigger ' || quote_ident($2));
$$ LANGUAGE SQL;

-- trigger_is( schema, table, trigger, schema, function, description )
CREATE OR REPLACE FUNCTION trigger_is ( NAME, NAME, NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    pname text;
BEGIN
    SELECT quote_ident(ni.nspname) || '.' || quote_ident(p.proname)
      FROM pg_catalog.pg_trigger t
      JOIN pg_catalog.pg_class ct     ON ct.oid = t.tgrelid
      JOIN pg_catalog.pg_namespace nt ON nt.oid = ct.relnamespace
      JOIN pg_catalog.pg_proc p       ON p.oid = t.tgfoid
      JOIN pg_catalog.pg_namespace ni ON ni.oid = p.pronamespace
     WHERE nt.nspname = $1
       AND ct.relname = $2
       AND t.tgname   = $3
      INTO pname;

    RETURN is( pname, quote_ident($4) || '.' || quote_ident($5), $6 );
END;
$$ LANGUAGE plpgsql;

-- trigger_is( schema, table, trigger, schema, function )
CREATE OR REPLACE FUNCTION trigger_is ( NAME, NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT trigger_is(
        $1, $2, $3, $4, $5,
        'Trigger ' || quote_ident($3) || ' should call ' || quote_ident($4) || '.' || quote_ident($5) || '()'
    );
$$ LANGUAGE sql;

-- trigger_is( table, trigger, function, description )
CREATE OR REPLACE FUNCTION trigger_is ( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
DECLARE
    pname text;
BEGIN
    SELECT p.proname
      FROM pg_catalog.pg_trigger t
      JOIN pg_catalog.pg_class ct ON ct.oid = t.tgrelid
      JOIN pg_catalog.pg_proc p   ON p.oid = t.tgfoid
     WHERE ct.relname = $1
       AND t.tgname   = $2
       AND pg_catalog.pg_table_is_visible(ct.oid)
      INTO pname;

    RETURN is( pname, $3::text, $4 );
END;
$$ LANGUAGE plpgsql;

-- trigger_is( table, trigger, function )
CREATE OR REPLACE FUNCTION trigger_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT trigger_is(
        $1, $2, $3,
        'Trigger ' || quote_ident($2) || ' should call ' || quote_ident($3) || '()'
    );
$$ LANGUAGE sql;

-- has_schema( schema, description )
CREATE OR REPLACE FUNCTION has_schema( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(
        EXISTS(
            SELECT true
              FROM pg_catalog.pg_namespace
             WHERE nspname = $1
        ), $2
    );
$$ LANGUAGE sql;

-- has_schema( schema )
CREATE OR REPLACE FUNCTION has_schema( NAME )
RETURNS TEXT AS $$
    SELECT has_schema( $1, 'Schema ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE sql;

-- hasnt_schema( schema, description )
CREATE OR REPLACE FUNCTION hasnt_schema( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(
        NOT EXISTS(
            SELECT true
              FROM pg_catalog.pg_namespace
             WHERE nspname = $1
        ), $2
    );
$$ LANGUAGE sql;

-- hasnt_schema( schema )
CREATE OR REPLACE FUNCTION hasnt_schema( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_schema( $1, 'Schema ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE sql;

-- has_tablespace( tablespace, location, description )
CREATE OR REPLACE FUNCTION has_tablespace( NAME, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    IF pg_version_num() >= 90200 THEN
        RETURN ok(
            EXISTS(
                SELECT true
                  FROM pg_catalog.pg_tablespace
                 WHERE spcname = $1
                   AND pg_tablespace_location(oid) = $2
            ), $3
        );
    ELSE
        RETURN ok(
            EXISTS(
                SELECT true
                  FROM pg_catalog.pg_tablespace
                 WHERE spcname = $1
                   AND spclocation = $2
            ), $3
        );
    END IF;
END;
$$ LANGUAGE plpgsql;

-- has_tablespace( tablespace, description )
CREATE OR REPLACE FUNCTION has_tablespace( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(
        EXISTS(
            SELECT true
              FROM pg_catalog.pg_tablespace
             WHERE spcname = $1
        ), $2
    );
$$ LANGUAGE sql;

-- has_tablespace( tablespace )
CREATE OR REPLACE FUNCTION has_tablespace( NAME )
RETURNS TEXT AS $$
    SELECT has_tablespace( $1, 'Tablespace ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE sql;

-- hasnt_tablespace( tablespace, description )
CREATE OR REPLACE FUNCTION hasnt_tablespace( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(
        NOT EXISTS(
            SELECT true
              FROM pg_catalog.pg_tablespace
             WHERE spcname = $1
        ), $2
    );
$$ LANGUAGE sql;

-- hasnt_tablespace( tablespace )
CREATE OR REPLACE FUNCTION hasnt_tablespace( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_tablespace( $1, 'Tablespace ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_type( NAME, NAME, CHAR[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_type t
          JOIN pg_catalog.pg_namespace n ON t.typnamespace = n.oid
         WHERE t.typisdefined
           AND n.nspname = $1
           AND t.typname = $2
           AND t.typtype = ANY( COALESCE($3, ARRAY['b', 'c', 'd', 'p', 'e']) )
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_type( NAME, CHAR[] )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_type t
         WHERE t.typisdefined
           AND pg_catalog.pg_type_is_visible(t.oid)
           AND t.typname = $1
           AND t.typtype = ANY( COALESCE($2, ARRAY['b', 'c', 'd', 'p', 'e']) )
    );
$$ LANGUAGE sql;

-- has_type( schema, type, description )
CREATE OR REPLACE FUNCTION has_type( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, $2, NULL ), $3 );
$$ LANGUAGE sql;

-- has_type( schema, type )
CREATE OR REPLACE FUNCTION has_type( NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_type( $1, $2, 'Type ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist' );
$$ LANGUAGE sql;

-- has_type( type, description )
CREATE OR REPLACE FUNCTION has_type( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, NULL ), $2 );
$$ LANGUAGE sql;

-- has_type( type )
CREATE OR REPLACE FUNCTION has_type( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, NULL ), ('Type ' || quote_ident($1) || ' should exist')::text );
$$ LANGUAGE sql;

-- hasnt_type( schema, type, description )
CREATE OR REPLACE FUNCTION hasnt_type( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, $2, NULL ), $3 );
$$ LANGUAGE sql;

-- hasnt_type( schema, type )
CREATE OR REPLACE FUNCTION hasnt_type( NAME, NAME )
RETURNS TEXT AS $$
    SELECT hasnt_type( $1, $2, 'Type ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist' );
$$ LANGUAGE sql;

-- hasnt_type( type, description )
CREATE OR REPLACE FUNCTION hasnt_type( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, NULL ), $2 );
$$ LANGUAGE sql;

-- hasnt_type( type )
CREATE OR REPLACE FUNCTION hasnt_type( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, NULL ), ('Type ' || quote_ident($1) || ' should not exist')::text );
$$ LANGUAGE sql;

-- has_domain( schema, domain, description )
CREATE OR REPLACE FUNCTION has_domain( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, $2, ARRAY['d'] ), $3 );
$$ LANGUAGE sql;

-- has_domain( schema, domain )
CREATE OR REPLACE FUNCTION has_domain( NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_domain( $1, $2, 'Domain ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist' );
$$ LANGUAGE sql;

-- has_domain( domain, description )
CREATE OR REPLACE FUNCTION has_domain( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, ARRAY['d'] ), $2 );
$$ LANGUAGE sql;

-- has_domain( domain )
CREATE OR REPLACE FUNCTION has_domain( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, ARRAY['d'] ), ('Domain ' || quote_ident($1) || ' should exist')::text );
$$ LANGUAGE sql;

-- hasnt_domain( schema, domain, description )
CREATE OR REPLACE FUNCTION hasnt_domain( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, $2, ARRAY['d'] ), $3 );
$$ LANGUAGE sql;

-- hasnt_domain( schema, domain )
CREATE OR REPLACE FUNCTION hasnt_domain( NAME, NAME )
RETURNS TEXT AS $$
    SELECT hasnt_domain( $1, $2, 'Domain ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist' );
$$ LANGUAGE sql;

-- hasnt_domain( domain, description )
CREATE OR REPLACE FUNCTION hasnt_domain( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, ARRAY['d'] ), $2 );
$$ LANGUAGE sql;

-- hasnt_domain( domain )
CREATE OR REPLACE FUNCTION hasnt_domain( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, ARRAY['d'] ), ('Domain ' || quote_ident($1) || ' should not exist')::text );
$$ LANGUAGE sql;

-- has_enum( schema, enum, description )
CREATE OR REPLACE FUNCTION has_enum( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, $2, ARRAY['e'] ), $3 );
$$ LANGUAGE sql;

-- has_enum( schema, enum )
CREATE OR REPLACE FUNCTION has_enum( NAME, NAME )
RETURNS TEXT AS $$
    SELECT has_enum( $1, $2, 'Enum ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist' );
$$ LANGUAGE sql;

-- has_enum( enum, description )
CREATE OR REPLACE FUNCTION has_enum( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, ARRAY['e'] ), $2 );
$$ LANGUAGE sql;

-- has_enum( enum )
CREATE OR REPLACE FUNCTION has_enum( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_type( $1, ARRAY['e'] ), ('Enum ' || quote_ident($1) || ' should exist')::text );
$$ LANGUAGE sql;

-- hasnt_enum( schema, enum, description )
CREATE OR REPLACE FUNCTION hasnt_enum( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, $2, ARRAY['e'] ), $3 );
$$ LANGUAGE sql;

-- hasnt_enum( schema, enum )
CREATE OR REPLACE FUNCTION hasnt_enum( NAME, NAME )
RETURNS TEXT AS $$
    SELECT hasnt_enum( $1, $2, 'Enum ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist' );
$$ LANGUAGE sql;

-- hasnt_enum( enum, description )
CREATE OR REPLACE FUNCTION hasnt_enum( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, ARRAY['e'] ), $2 );
$$ LANGUAGE sql;

-- hasnt_enum( enum )
CREATE OR REPLACE FUNCTION hasnt_enum( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_type( $1, ARRAY['e'] ), ('Enum ' || quote_ident($1) || ' should not exist')::text );
$$ LANGUAGE sql;

-- enum_has_labels( schema, enum, labels, description )
CREATE OR REPLACE FUNCTION enum_has_labels( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT is(
        ARRAY(
            SELECT e.enumlabel
              FROM pg_catalog.pg_type t
              JOIN pg_catalog.pg_enum e      ON t.oid = e.enumtypid
              JOIN pg_catalog.pg_namespace n ON t.typnamespace = n.oid
              WHERE t.typisdefined
               AND n.nspname = $1
               AND t.typname = $2
               AND t.typtype = 'e'
             ORDER BY e.enumsortorder
        ),
        $3,
        $4
    );
$$ LANGUAGE sql;

-- enum_has_labels( schema, enum, labels )
CREATE OR REPLACE FUNCTION enum_has_labels( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT enum_has_labels(
        $1, $2, $3,
        'Enum ' || quote_ident($1) || '.' || quote_ident($2) || ' should have labels (' || array_to_string( $3, ', ' ) || ')'
    );
$$ LANGUAGE sql;

-- enum_has_labels( enum, labels, description )
CREATE OR REPLACE FUNCTION enum_has_labels( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT is(
        ARRAY(
            SELECT e.enumlabel
              FROM pg_catalog.pg_type t
              JOIN pg_catalog.pg_enum e ON t.oid = e.enumtypid
              WHERE t.typisdefined
               AND pg_catalog.pg_type_is_visible(t.oid)
               AND t.typname = $1
               AND t.typtype = 'e'
             ORDER BY e.enumsortorder
        ),
        $2,
        $3
    );
$$ LANGUAGE sql;

-- enum_has_labels( enum, labels )
CREATE OR REPLACE FUNCTION enum_has_labels( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT enum_has_labels(
        $1, $2,
        'Enum ' || quote_ident($1) || ' should have labels (' || array_to_string( $2, ', ' ) || ')'
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_role( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_roles
         WHERE rolname = $1
    );
$$ LANGUAGE sql STRICT;

-- has_role( role, description )
CREATE OR REPLACE FUNCTION has_role( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_role($1), $2 );
$$ LANGUAGE sql;

-- has_role( role )
CREATE OR REPLACE FUNCTION has_role( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_role($1), 'Role ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE sql;

-- hasnt_role( role, description )
CREATE OR REPLACE FUNCTION hasnt_role( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_role($1), $2 );
$$ LANGUAGE sql;

-- hasnt_role( role )
CREATE OR REPLACE FUNCTION hasnt_role( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_role($1), 'Role ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_user( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS( SELECT true FROM pg_catalog.pg_user WHERE usename = $1);
$$ LANGUAGE sql STRICT;

-- has_user( user, description )
CREATE OR REPLACE FUNCTION has_user( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_user($1), $2 );
$$ LANGUAGE sql;

-- has_user( user )
CREATE OR REPLACE FUNCTION has_user( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_user( $1 ), 'User ' || quote_ident($1) || ' should exist');
$$ LANGUAGE sql;

-- hasnt_user( user, description )
CREATE OR REPLACE FUNCTION hasnt_user( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_user($1), $2 );
$$ LANGUAGE sql;

-- hasnt_user( user )
CREATE OR REPLACE FUNCTION hasnt_user( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_user( $1 ), 'User ' || quote_ident($1) || ' should not exist');
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _is_super( NAME )
RETURNS BOOLEAN AS $$
    SELECT rolsuper
      FROM pg_catalog.pg_roles
     WHERE rolname = $1
$$ LANGUAGE sql STRICT;

-- is_superuser( user, description )
CREATE OR REPLACE FUNCTION is_superuser( NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    is_super boolean := _is_super($1);
BEGIN
    IF is_super IS NULL THEN
        RETURN fail( $2 ) || E'\n' || diag( '    User ' || quote_ident($1) || ' does not exist') ;
    END IF;
    RETURN ok( is_super, $2 );
END;
$$ LANGUAGE plpgsql;

-- is_superuser( user )
CREATE OR REPLACE FUNCTION is_superuser( NAME )
RETURNS TEXT AS $$
    SELECT is_superuser( $1, 'User ' || quote_ident($1) || ' should be a super user' );
$$ LANGUAGE sql;

-- isnt_superuser( user, description )
CREATE OR REPLACE FUNCTION isnt_superuser( NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    is_super boolean := _is_super($1);
BEGIN
    IF is_super IS NULL THEN
        RETURN fail( $2 ) || E'\n' || diag( '    User ' || quote_ident($1) || ' does not exist') ;
    END IF;
    RETURN ok( NOT is_super, $2 );
END;
$$ LANGUAGE plpgsql;

-- isnt_superuser( user )
CREATE OR REPLACE FUNCTION isnt_superuser( NAME )
RETURNS TEXT AS $$
    SELECT isnt_superuser( $1, 'User ' || quote_ident($1) || ' should not be a super user' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _has_group( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_group
         WHERE groname = $1
    );
$$ LANGUAGE sql STRICT;

-- has_group( group, description )
CREATE OR REPLACE FUNCTION has_group( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _has_group($1), $2 );
$$ LANGUAGE sql;

-- has_group( group )
CREATE OR REPLACE FUNCTION has_group( NAME )
RETURNS TEXT AS $$
    SELECT ok( _has_group($1), 'Group ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE sql;

-- hasnt_group( group, description )
CREATE OR REPLACE FUNCTION hasnt_group( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_group($1), $2 );
$$ LANGUAGE sql;

-- hasnt_group( group )
CREATE OR REPLACE FUNCTION hasnt_group( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _has_group($1), 'Group ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _grolist ( NAME )
RETURNS oid[] AS $$
    SELECT ARRAY(
        SELECT member
          FROM pg_catalog.pg_auth_members m
          JOIN pg_catalog.pg_roles r ON m.roleid = r.oid
         WHERE r.rolname =  $1
    );
$$ LANGUAGE sql;

-- is_member_of( role, members[], description )
CREATE OR REPLACE FUNCTION is_member_of( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    missing text[];
BEGIN
    IF NOT _has_role($1) THEN
        RETURN fail( $3 ) || E'\n' || diag (
            '    Role ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    SELECT ARRAY(
        SELECT quote_ident($2[i])
          FROM generate_series(1, array_upper($2, 1)) s(i)
          LEFT JOIN pg_catalog.pg_roles r ON rolname = $2[i]
         WHERE r.oid IS NULL
            OR NOT r.oid = ANY ( _grolist($1) )
         ORDER BY s.i
    ) INTO missing;
    IF missing[1] IS NULL THEN
        RETURN ok( true, $3 );
    END IF;
    RETURN ok( false, $3 ) || E'\n' || diag(
        '    Members missing from the ' || quote_ident($1) || E' role:\n        ' ||
        array_to_string( missing, E'\n        ')
    );
END;
$$ LANGUAGE plpgsql;

-- is_member_of( role, member, description )
CREATE OR REPLACE FUNCTION is_member_of( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT is_member_of( $1, ARRAY[$2], $3 );
$$ LANGUAGE SQL;

-- is_member_of( role, members[] )
CREATE OR REPLACE FUNCTION is_member_of( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT is_member_of( $1, $2, 'Should have members of role ' || quote_ident($1) );
$$ LANGUAGE SQL;

-- is_member_of( role, member )
CREATE OR REPLACE FUNCTION is_member_of( NAME, NAME )
RETURNS TEXT AS $$
    SELECT is_member_of( $1, ARRAY[$2] );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _cmp_types(oid, name)
RETURNS BOOLEAN AS $$
DECLARE
    dtype TEXT := pg_catalog.format_type($1, NULL);
BEGIN
    RETURN dtype = _quote_ident_like($2, dtype);
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _cast_exists ( NAME, NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_cast c
         JOIN pg_catalog.pg_proc p ON c.castfunc = p.oid
         JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid
        WHERE _cmp_types(castsource, $1)
          AND _cmp_types(casttarget, $2)
          AND n.nspname   = $3
          AND p.proname   = $4
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _cast_exists ( NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_cast c
         JOIN pg_catalog.pg_proc p ON c.castfunc = p.oid
        WHERE _cmp_types(castsource, $1)
          AND _cmp_types(casttarget, $2)
          AND p.proname   = $3
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _cast_exists ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_cast c
        WHERE _cmp_types(castsource, $1)
          AND _cmp_types(casttarget, $2)
   );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type, schema, function, description )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
   SELECT ok( _cast_exists( $1, $2, $3, $4 ), $5 );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type, schema, function )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
   SELECT ok(
       _cast_exists( $1, $2, $3, $4 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') WITH FUNCTION ' || quote_ident($3)
        || '.' || quote_ident($4) || '() should exist'
    );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type, function, description )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
   SELECT ok( _cast_exists( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type, function )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME, NAME )
RETURNS TEXT AS $$
   SELECT ok(
        _cast_exists( $1, $2, $3 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') WITH FUNCTION ' || quote_ident($3) || '() should exist'
    );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type, description )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _cast_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_cast( source_type, target_type )
CREATE OR REPLACE FUNCTION has_cast ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _cast_exists( $1, $2 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') should exist'
    );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type, schema, function, description )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
   SELECT ok( NOT _cast_exists( $1, $2, $3, $4 ), $5 );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type, schema, function )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
   SELECT ok(
       NOT _cast_exists( $1, $2, $3, $4 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') WITH FUNCTION ' || quote_ident($3)
        || '.' || quote_ident($4) || '() should not exist'
    );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type, function, description )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
   SELECT ok( NOT _cast_exists( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type, function )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME, NAME )
RETURNS TEXT AS $$
   SELECT ok(
        NOT _cast_exists( $1, $2, $3 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') WITH FUNCTION ' || quote_ident($3) || '() should not exist'
    );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type, description )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _cast_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_cast( source_type, target_type )
CREATE OR REPLACE FUNCTION hasnt_cast ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _cast_exists( $1, $2 ),
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') should not exist'
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _expand_context( char )
RETURNS text AS $$
   SELECT CASE $1
          WHEN 'i' THEN 'implicit'
          WHEN 'a' THEN 'assignment'
          WHEN 'e' THEN 'explicit'
          ELSE          'unknown' END
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _get_context( NAME, NAME )
RETURNS "char" AS $$
   SELECT c.castcontext
     FROM pg_catalog.pg_cast c
    WHERE _cmp_types(castsource, $1)
      AND _cmp_types(casttarget, $2)
$$ LANGUAGE SQL;

-- cast_context_is( source_type, target_type, context, description )
CREATE OR REPLACE FUNCTION cast_context_is( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    want char = substring(LOWER($3) FROM 1 FOR 1);
    have char := _get_context($1, $2);
BEGIN
    IF have IS NOT NULL THEN
        RETURN is( _expand_context(have), _expand_context(want), $4 );
    END IF;

    RETURN ok( false, $4 ) || E'\n' || diag(
       '    Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
      || ') does not exist'
    );
END;
$$ LANGUAGE plpgsql;

-- cast_context_is( source_type, target_type, context )
CREATE OR REPLACE FUNCTION cast_context_is( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT cast_context_is(
        $1, $2, $3,
        'Cast (' || quote_ident($1) || ' AS ' || quote_ident($2)
        || ') context should be ' || _expand_context(substring(LOWER($3) FROM 1 FOR 1))
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _op_exists ( NAME, NAME, NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_operator o
         JOIN pg_catalog.pg_namespace n ON o.oprnamespace = n.oid
        WHERE n.nspname = $2
          AND o.oprname = $3
          AND CASE o.oprkind WHEN 'l' THEN $1 IS NULL
              ELSE _cmp_types(o.oprleft, $1) END
          AND CASE o.oprkind WHEN 'r' THEN $4 IS NULL
              ELSE _cmp_types(o.oprright, $4) END
          AND _cmp_types(o.oprresult, $5)
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _op_exists ( NAME, NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_operator o
        WHERE pg_catalog.pg_operator_is_visible(o.oid)
          AND o.oprname = $2
          AND CASE o.oprkind WHEN 'l' THEN $1 IS NULL
              ELSE _cmp_types(o.oprleft, $1) END
          AND CASE o.oprkind WHEN 'r' THEN $3 IS NULL
              ELSE _cmp_types(o.oprright, $3) END
          AND _cmp_types(o.oprresult, $4)
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _op_exists ( NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
       SELECT TRUE
         FROM pg_catalog.pg_operator o
        WHERE pg_catalog.pg_operator_is_visible(o.oid)
          AND o.oprname = $2
          AND CASE o.oprkind WHEN 'l' THEN $1 IS NULL
              ELSE _cmp_types(o.oprleft, $1) END
          AND CASE o.oprkind WHEN 'r' THEN $3 IS NULL
              ELSE _cmp_types(o.oprright, $3) END
   );
$$ LANGUAGE SQL;

-- has_operator( left_type, schema, name, right_type, return_type, description )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists($1, $2, $3, $4, $5 ), $6 );
$$ LANGUAGE SQL;

-- has_operator( left_type, schema, name, right_type, return_type )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, $3, $4, $5 ),
        'Operator ' || quote_ident($2) || '.' || $3 || '(' || $1 || ',' || $4
        || ') RETURNS ' || $5 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_operator( left_type, name, right_type, return_type, description )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists($1, $2, $3, $4 ), $5 );
$$ LANGUAGE SQL;

-- has_operator( left_type, name, right_type, return_type )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, $3, $4 ),
        'Operator ' ||  $2 || '(' || $1 || ',' || $3
        || ') RETURNS ' || $4 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_operator( left_type, name, right_type, description )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists($1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- has_operator( left_type, name, right_type )
CREATE OR REPLACE FUNCTION has_operator ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, $3 ),
        'Operator ' ||  $2 || '(' || $1 || ',' || $3
        || ') should exist'
    );
$$ LANGUAGE SQL;

-- has_leftop( schema, name, right_type, return_type, description )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists(NULL, $1, $2, $3, $4), $5 );
$$ LANGUAGE SQL;

-- has_leftop( schema, name, right_type, return_type )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists(NULL, $1, $2, $3, $4 ),
        'Left operator ' || quote_ident($1) || '.' || $2 || '(NONE,'
        || $3 || ') RETURNS ' || $4 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_leftop( name, right_type, return_type, description )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists(NULL, $1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- has_leftop( name, right_type, return_type )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists(NULL, $1, $2, $3 ),
        'Left operator ' || $1 || '(NONE,' || $2 || ') RETURNS ' || $3 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_leftop( name, right_type, description )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists(NULL, $1, $2), $3 );
$$ LANGUAGE SQL;

-- has_leftop( name, right_type )
CREATE OR REPLACE FUNCTION has_leftop ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists(NULL, $1, $2 ),
        'Left operator ' || $1 || '(NONE,' || $2 || ') should exist'
    );
$$ LANGUAGE SQL;

-- has_rightop( left_type, schema, name, return_type, description )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists( $1, $2, $3, NULL, $4), $5 );
$$ LANGUAGE SQL;

-- has_rightop( left_type, schema, name, return_type )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, $3, NULL, $4 ),
        'Right operator ' || quote_ident($2) || '.' || $3 || '('
        || $1 || ',NONE) RETURNS ' || $4 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_rightop( left_type, name, return_type, description )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists( $1, $2, NULL, $3), $4 );
$$ LANGUAGE SQL;

-- has_rightop( left_type, name, return_type )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, NULL, $3 ),
        'Right operator ' || $2 || '('
        || $1 || ',NONE) RETURNS ' || $3 || ' should exist'
    );
$$ LANGUAGE SQL;

-- has_rightop( left_type, name, description )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _op_exists( $1, $2, NULL), $3 );
$$ LANGUAGE SQL;

-- has_rightop( left_type, name )
CREATE OR REPLACE FUNCTION has_rightop ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
         _op_exists($1, $2, NULL ),
        'Right operator ' || $2 || '(' || $1 || ',NONE) should exist'
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _are ( text, name[], name[], TEXT )
RETURNS TEXT AS $$
DECLARE
    what    ALIAS FOR $1;
    extras  ALIAS FOR $2;
    missing ALIAS FOR $3;
    descr   ALIAS FOR $4;
    msg     TEXT    := '';
    res     BOOLEAN := TRUE;
BEGIN
    IF extras[1] IS NOT NULL THEN
        res = FALSE;
        msg := E'\n' || diag(
            '    Extra ' || what || E':\n        '
            ||  _ident_array_to_sorted_string( extras, E'\n        ' )
        );
    END IF;
    IF missing[1] IS NOT NULL THEN
        res = FALSE;
        msg := msg || E'\n' || diag(
            '    Missing ' || what || E':\n        '
            ||  _ident_array_to_sorted_string( missing, E'\n        ' )
        );
    END IF;

    RETURN ok(res, descr) || msg;
END;
$$ LANGUAGE plpgsql;

-- tablespaces_are( tablespaces, description )
CREATE OR REPLACE FUNCTION tablespaces_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'tablespaces',
        ARRAY(
            SELECT spcname
              FROM pg_catalog.pg_tablespace
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
               FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT spcname
              FROM pg_catalog.pg_tablespace
        ),
        $2
    );
$$ LANGUAGE SQL;

-- tablespaces_are( tablespaces )
CREATE OR REPLACE FUNCTION tablespaces_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT tablespaces_are( $1, 'There should be the correct tablespaces' );
$$ LANGUAGE SQL;

-- schemas_are( schemas, description )
CREATE OR REPLACE FUNCTION schemas_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'schemas',
        ARRAY(
            SELECT nspname
              FROM pg_catalog.pg_namespace
             WHERE nspname NOT LIKE 'pg_%'
               AND nspname <> 'information_schema'
             EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT nspname
              FROM pg_catalog.pg_namespace
             WHERE nspname NOT LIKE 'pg_%'
               AND nspname <> 'information_schema'
        ),
        $2
    );
$$ LANGUAGE SQL;

-- schemas_are( schemas )
CREATE OR REPLACE FUNCTION schemas_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT schemas_are( $1, 'There should be the correct schemas' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _extras ( CHAR[], NAME, NAME[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT c.relname
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE c.relkind = ANY($1)
           AND n.nspname = $2
           AND c.relname NOT IN('pg_all_foreign_keys', 'tap_funky', '__tresults___numb_seq', '__tcache___id_seq')
        EXCEPT
        SELECT $3[i]
          FROM generate_series(1, array_upper($3, 1)) s(i)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _extras ( CHAR[], NAME[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT c.relname
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE pg_catalog.pg_table_is_visible(c.oid)
           AND n.nspname <> 'pg_catalog'
           AND c.relkind = ANY($1)
           AND c.relname NOT IN ('__tcache__', 'pg_all_foreign_keys', 'tap_funky', '__tresults___numb_seq', '__tcache___id_seq')
        EXCEPT
        SELECT $2[i]
          FROM generate_series(1, array_upper($2, 1)) s(i)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _extras ( CHAR, NAME, NAME[] )
RETURNS NAME[] AS $$
    SELECT _extras(ARRAY[$1], $2, $3);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _extras ( CHAR, NAME[] )
RETURNS NAME[] AS $$
SELECT _extras(ARRAY[$1], $2);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _missing ( CHAR[], NAME, NAME[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT $3[i]
          FROM generate_series(1, array_upper($3, 1)) s(i)
        EXCEPT
        SELECT c.relname
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE c.relkind = ANY($1)
           AND n.nspname = $2
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _missing ( CHAR[], NAME[] )
RETURNS NAME[] AS $$
    SELECT ARRAY(
        SELECT $2[i]
          FROM generate_series(1, array_upper($2, 1)) s(i)
        EXCEPT
        SELECT c.relname
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE pg_catalog.pg_table_is_visible(c.oid)
           AND n.nspname NOT IN ('pg_catalog', 'information_schema')
           AND c.relkind = ANY($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _missing ( CHAR, NAME, NAME[] )
RETURNS NAME[] AS $$
    SELECT _missing(ARRAY[$1], $2, $3);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _missing ( CHAR, NAME[] )
RETURNS NAME[] AS $$
    SELECT _missing(ARRAY[$1], $2);
$$ LANGUAGE SQL;

-- tables_are( schema, tables, description )
CREATE OR REPLACE FUNCTION tables_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'tables', _extras('{r,p}'::char[], $1, $2), _missing('{r,p}'::char[], $1, $2), $3);
$$ LANGUAGE SQL;

-- tables_are( tables, description )
CREATE OR REPLACE FUNCTION tables_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'tables', _extras('{r,p}'::char[], $1), _missing('{r,p}'::char[], $1), $2);
$$ LANGUAGE SQL;

-- tables_are( schema, tables )
CREATE OR REPLACE FUNCTION tables_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'tables', _extras('{r,p}'::char[], $1, $2), _missing('{r,p}'::char[], $1, $2),
        'Schema ' || quote_ident($1) || ' should have the correct tables'
    );
$$ LANGUAGE SQL;

-- tables_are( tables )
CREATE OR REPLACE FUNCTION tables_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'tables', _extras('{r,p}'::char[], $1), _missing('{r,p}'::char[], $1),
        'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct tables'
    );
$$ LANGUAGE SQL;

-- views_are( schema, views, description )
CREATE OR REPLACE FUNCTION views_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'views', _extras('v', $1, $2), _missing('v', $1, $2), $3);
$$ LANGUAGE SQL;

-- views_are( views, description )
CREATE OR REPLACE FUNCTION views_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'views', _extras('v', $1), _missing('v', $1), $2);
$$ LANGUAGE SQL;

-- views_are( schema, views )
CREATE OR REPLACE FUNCTION views_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'views', _extras('v', $1, $2), _missing('v', $1, $2),
        'Schema ' || quote_ident($1) || ' should have the correct views'
    );
$$ LANGUAGE SQL;

-- views_are( views )
CREATE OR REPLACE FUNCTION views_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'views', _extras('v', $1), _missing('v', $1),
        'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct views'
    );
$$ LANGUAGE SQL;

-- sequences_are( schema, sequences, description )
CREATE OR REPLACE FUNCTION sequences_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'sequences', _extras('S', $1, $2), _missing('S', $1, $2), $3);
$$ LANGUAGE SQL;

-- sequences_are( sequences, description )
CREATE OR REPLACE FUNCTION sequences_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'sequences', _extras('S', $1), _missing('S', $1), $2);
$$ LANGUAGE SQL;

-- sequences_are( schema, sequences )
CREATE OR REPLACE FUNCTION sequences_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'sequences', _extras('S', $1, $2), _missing('S', $1, $2),
        'Schema ' || quote_ident($1) || ' should have the correct sequences'
    );
$$ LANGUAGE SQL;

-- sequences_are( sequences )
CREATE OR REPLACE FUNCTION sequences_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'sequences', _extras('S', $1), _missing('S', $1),
        'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct sequences'
    );
$$ LANGUAGE SQL;

-- functions_are( schema, functions[], description )
CREATE OR REPLACE FUNCTION functions_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'functions',
        ARRAY(
            SELECT name FROM tap_funky WHERE schema = $1
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
               FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT name FROM tap_funky WHERE schema = $1
        ),
        $3
    );
$$ LANGUAGE SQL;

-- functions_are( schema, functions[] )
CREATE OR REPLACE FUNCTION functions_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT functions_are( $1, $2, 'Schema ' || quote_ident($1) || ' should have the correct functions' );
$$ LANGUAGE SQL;

-- functions_are( functions[], description )
CREATE OR REPLACE FUNCTION functions_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'functions',
        ARRAY(
            SELECT name FROM tap_funky WHERE is_visible
            AND schema NOT IN ('pg_catalog', 'information_schema')
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
               FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT name FROM tap_funky WHERE is_visible
            AND schema NOT IN ('pg_catalog', 'information_schema')
        ),
        $2
    );
$$ LANGUAGE SQL;

-- functions_are( functions[] )
CREATE OR REPLACE FUNCTION functions_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT functions_are( $1, 'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct functions' );
$$ LANGUAGE SQL;

-- indexes_are( schema, table, indexes[], description )
CREATE OR REPLACE FUNCTION indexes_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'indexes',
        ARRAY(
            SELECT ci.relname
              FROM pg_catalog.pg_index x
              JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
              JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
             WHERE ct.relname = $2
               AND n.nspname  = $1
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT ci.relname
              FROM pg_catalog.pg_index x
              JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
              JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
             WHERE ct.relname = $2
               AND n.nspname  = $1
        ),
        $4
    );
$$ LANGUAGE SQL;

-- indexes_are( schema, table, indexes[] )
CREATE OR REPLACE FUNCTION indexes_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT indexes_are( $1, $2, $3, 'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct indexes' );
$$ LANGUAGE SQL;

-- indexes_are( table, indexes[], description )
CREATE OR REPLACE FUNCTION indexes_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'indexes',
        ARRAY(
            SELECT ci.relname
              FROM pg_catalog.pg_index x
              JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
              JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
             WHERE ct.relname = $1
               AND pg_catalog.pg_table_is_visible(ct.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT ci.relname
              FROM pg_catalog.pg_index x
              JOIN pg_catalog.pg_class ct ON ct.oid = x.indrelid
              JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
             WHERE ct.relname = $1
               AND pg_catalog.pg_table_is_visible(ct.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
        ),
        $3
    );
$$ LANGUAGE SQL;

-- indexes_are( table, indexes[] )
CREATE OR REPLACE FUNCTION indexes_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT indexes_are( $1, $2, 'Table ' || quote_ident($1) || ' should have the correct indexes' );
$$ LANGUAGE SQL;

-- users_are( users[], description )
CREATE OR REPLACE FUNCTION users_are( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'users',
        ARRAY(
            SELECT usename
              FROM pg_catalog.pg_user
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT usename
              FROM pg_catalog.pg_user
        ),
        $2
    );
$$ LANGUAGE SQL;

-- users_are( users[] )
CREATE OR REPLACE FUNCTION users_are( NAME[] )
RETURNS TEXT AS $$
    SELECT users_are( $1, 'There should be the correct users' );
$$ LANGUAGE SQL;

-- groups_are( groups[], description )
CREATE OR REPLACE FUNCTION groups_are( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'groups',
        ARRAY(
            SELECT groname
              FROM pg_catalog.pg_group
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT groname
              FROM pg_catalog.pg_group
        ),
        $2
    );
$$ LANGUAGE SQL;

-- groups_are( groups[] )
CREATE OR REPLACE FUNCTION groups_are( NAME[] )
RETURNS TEXT AS $$
    SELECT groups_are( $1, 'There should be the correct groups' );
$$ LANGUAGE SQL;

-- languages_are( languages[], description )
CREATE OR REPLACE FUNCTION languages_are( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'languages',
        ARRAY(
            SELECT lanname
              FROM pg_catalog.pg_language
             WHERE lanispl
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT lanname
              FROM pg_catalog.pg_language
             WHERE lanispl
        ),
        $2
    );
$$ LANGUAGE SQL;

-- languages_are( languages[] )
CREATE OR REPLACE FUNCTION languages_are( NAME[] )
RETURNS TEXT AS $$
    SELECT languages_are( $1, 'There should be the correct procedural languages' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _is_trusted( NAME )
RETURNS BOOLEAN AS $$
    SELECT lanpltrusted FROM pg_catalog.pg_language WHERE lanname = $1;
$$ LANGUAGE SQL;

-- has_language( language, description)
CREATE OR REPLACE FUNCTION has_language( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_trusted($1) IS NOT NULL, $2 );
$$ LANGUAGE SQL;

-- has_language( language )
CREATE OR REPLACE FUNCTION has_language( NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_trusted($1) IS NOT NULL, 'Procedural language ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_language( language, description)
CREATE OR REPLACE FUNCTION hasnt_language( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_trusted($1) IS NULL, $2 );
$$ LANGUAGE SQL;

-- hasnt_language( language )
CREATE OR REPLACE FUNCTION hasnt_language( NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_trusted($1) IS NULL, 'Procedural language ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- language_is_trusted( language, description )
CREATE OR REPLACE FUNCTION language_is_trusted( NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    is_trusted boolean := _is_trusted($1);
BEGIN
    IF is_trusted IS NULL THEN
        RETURN fail( $2 ) || E'\n' || diag( '    Procedural language ' || quote_ident($1) || ' does not exist') ;
    END IF;
    RETURN ok( is_trusted, $2 );
END;
$$ LANGUAGE plpgsql;

-- language_is_trusted( language )
CREATE OR REPLACE FUNCTION language_is_trusted( NAME )
RETURNS TEXT AS $$
    SELECT language_is_trusted($1, 'Procedural language ' || quote_ident($1) || ' should be trusted' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _opc_exists( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
        SELECT TRUE
          FROM pg_catalog.pg_opclass oc
          JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
         WHERE n.nspname  = $1
           AND oc.opcname = $2
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _opc_exists( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
        SELECT TRUE
          FROM pg_catalog.pg_opclass oc
         WHERE oc.opcname = $1
           AND pg_opclass_is_visible(oid)
    );
$$ LANGUAGE SQL;

-- has_opclass( schema, name, description )
CREATE OR REPLACE FUNCTION has_opclass( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _opc_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_opclass( schema, name )
CREATE OR REPLACE FUNCTION has_opclass( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _opc_exists( $1, $2 ), 'Operator class ' || quote_ident($1) || '.' || quote_ident($2) || ' should exist' );
$$ LANGUAGE SQL;

-- has_opclass( name, description )
CREATE OR REPLACE FUNCTION has_opclass( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _opc_exists( $1 ), $2)
$$ LANGUAGE SQL;

-- has_opclass( name )
CREATE OR REPLACE FUNCTION has_opclass( NAME )
RETURNS TEXT AS $$
    SELECT ok( _opc_exists( $1 ), 'Operator class ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_opclass( schema, name, description )
CREATE OR REPLACE FUNCTION hasnt_opclass( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _opc_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_opclass( schema, name )
CREATE OR REPLACE FUNCTION hasnt_opclass( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _opc_exists( $1, $2 ), 'Operator class ' || quote_ident($1) || '.' || quote_ident($2) || ' should not exist' );
$$ LANGUAGE SQL;

-- hasnt_opclass( name, description )
CREATE OR REPLACE FUNCTION hasnt_opclass( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _opc_exists( $1 ), $2)
$$ LANGUAGE SQL;

-- hasnt_opclass( name )
CREATE OR REPLACE FUNCTION hasnt_opclass( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _opc_exists( $1 ), 'Operator class ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- opclasses_are( schema, opclasses[], description )
CREATE OR REPLACE FUNCTION opclasses_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'operator classes',
        ARRAY(
            SELECT oc.opcname
              FROM pg_catalog.pg_opclass oc
              JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
             WHERE n.nspname  = $1
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
               FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT oc.opcname
              FROM pg_catalog.pg_opclass oc
              JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
             WHERE n.nspname  = $1
        ),
        $3
    );
$$ LANGUAGE SQL;

-- opclasses_are( schema, opclasses[] )
CREATE OR REPLACE FUNCTION opclasses_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT opclasses_are( $1, $2, 'Schema ' || quote_ident($1) || ' should have the correct operator classes' );
$$ LANGUAGE SQL;

-- opclasses_are( opclasses[], description )
CREATE OR REPLACE FUNCTION opclasses_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'operator classes',
        ARRAY(
            SELECT oc.opcname
              FROM pg_catalog.pg_opclass oc
              JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_opclass_is_visible(oc.oid)
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
               FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT oc.opcname
              FROM pg_catalog.pg_opclass oc
              JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_opclass_is_visible(oc.oid)
        ),
        $2
    );
$$ LANGUAGE SQL;

-- opclasses_are( opclasses[] )
CREATE OR REPLACE FUNCTION opclasses_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT opclasses_are( $1, 'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct operator classes' );
$$ LANGUAGE SQL;

-- rules_are( schema, table, rules[], description )
CREATE OR REPLACE FUNCTION rules_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'rules',
        ARRAY(
            SELECT r.rulename
              FROM pg_catalog.pg_rewrite r
              JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
              JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
             WHERE c.relname = $2
               AND n.nspname = $1
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT r.rulename
              FROM pg_catalog.pg_rewrite r
              JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
              JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
             WHERE c.relname = $2
               AND n.nspname = $1
        ),
        $4
    );
$$ LANGUAGE SQL;

-- rules_are( schema, table, rules[] )
CREATE OR REPLACE FUNCTION rules_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT rules_are( $1, $2, $3, 'Relation ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct rules' );
$$ LANGUAGE SQL;

-- rules_are( table, rules[], description )
CREATE OR REPLACE FUNCTION rules_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'rules',
        ARRAY(
            SELECT r.rulename
              FROM pg_catalog.pg_rewrite r
              JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
              JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
             WHERE c.relname = $1
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_table_is_visible(c.oid)
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT r.rulename
              FROM pg_catalog.pg_rewrite r
              JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
              JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
               AND c.relname = $1
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_table_is_visible(c.oid)
        ),
        $3
    );
$$ LANGUAGE SQL;

-- rules_are( table, rules[] )
CREATE OR REPLACE FUNCTION rules_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT rules_are( $1, $2, 'Relation ' || quote_ident($1) || ' should have the correct rules' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _is_instead( NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT r.is_instead
      FROM pg_catalog.pg_rewrite r
      JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
      JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
     WHERE r.rulename = $3
       AND c.relname  = $2
       AND n.nspname  = $1
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _is_instead( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT r.is_instead
      FROM pg_catalog.pg_rewrite r
      JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
     WHERE r.rulename = $2
       AND c.relname  = $1
       AND pg_catalog.pg_table_is_visible(c.oid)
$$ LANGUAGE SQL;

-- has_rule( schema, table, rule, description )
CREATE OR REPLACE FUNCTION has_rule( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2, $3) IS NOT NULL, $4 );
$$ LANGUAGE SQL;

-- has_rule( schema, table, rule )
CREATE OR REPLACE FUNCTION has_rule( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2, $3) IS NOT NULL, 'Relation ' || quote_ident($1) || '.' || quote_ident($2) || ' should have rule ' || quote_ident($3) );
$$ LANGUAGE SQL;

-- has_rule( table, rule, description )
CREATE OR REPLACE FUNCTION has_rule( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2) IS NOT NULL, $3 );
$$ LANGUAGE SQL;

-- has_rule( table, rule )
CREATE OR REPLACE FUNCTION has_rule( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2) IS NOT NULL, 'Relation ' || quote_ident($1) || ' should have rule ' || quote_ident($2) );
$$ LANGUAGE SQL;

-- hasnt_rule( schema, table, rule, description )
CREATE OR REPLACE FUNCTION hasnt_rule( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2, $3) IS NULL, $4 );
$$ LANGUAGE SQL;

-- hasnt_rule( schema, table, rule )
CREATE OR REPLACE FUNCTION hasnt_rule( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2, $3) IS NULL, 'Relation ' || quote_ident($1) || '.' || quote_ident($2) || ' should not have rule ' || quote_ident($3) );
$$ LANGUAGE SQL;

-- hasnt_rule( table, rule, description )
CREATE OR REPLACE FUNCTION hasnt_rule( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2) IS NULL, $3 );
$$ LANGUAGE SQL;

-- hasnt_rule( table, rule )
CREATE OR REPLACE FUNCTION hasnt_rule( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok( _is_instead($1, $2) IS NULL, 'Relation ' || quote_ident($1) || ' should not have rule ' || quote_ident($2) );
$$ LANGUAGE SQL;

-- rule_is_instead( schema, table, rule, description )
CREATE OR REPLACE FUNCTION rule_is_instead( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    is_it boolean := _is_instead($1, $2, $3);
BEGIN
    IF is_it IS NOT NULL THEN RETURN ok( is_it, $4 ); END IF;
    RETURN ok( FALSE, $4 ) || E'\n' || diag(
        '    Rule ' || quote_ident($3) || ' does not exist'
    );
END;
$$ LANGUAGE plpgsql;

-- rule_is_instead( schema, table, rule )
CREATE OR REPLACE FUNCTION rule_is_instead( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT rule_is_instead( $1, $2, $3, 'Rule ' || quote_ident($3) || ' on relation ' || quote_ident($1) || '.' || quote_ident($2) || ' should be an INSTEAD rule' );
$$ LANGUAGE SQL;

-- rule_is_instead( table, rule, description )
CREATE OR REPLACE FUNCTION rule_is_instead( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    is_it boolean := _is_instead($1, $2);
BEGIN
    IF is_it IS NOT NULL THEN RETURN ok( is_it, $3 ); END IF;
    RETURN ok( FALSE, $3 ) || E'\n' || diag(
        '    Rule ' || quote_ident($2) || ' does not exist'
    );
END;
$$ LANGUAGE plpgsql;

-- rule_is_instead( table, rule )
CREATE OR REPLACE FUNCTION rule_is_instead( NAME, NAME )
RETURNS TEXT AS $$
    SELECT rule_is_instead($1, $2, 'Rule ' || quote_ident($2) || ' on relation ' || quote_ident($1) || ' should be an INSTEAD rule' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _expand_on( char )
RETURNS text AS $$
   SELECT CASE $1
          WHEN '1' THEN 'SELECT'
          WHEN '2' THEN 'UPDATE'
          WHEN '3' THEN 'INSERT'
          WHEN '4' THEN 'DELETE'
          ELSE          'UNKNOWN' END
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _contract_on( TEXT )
RETURNS "char" AS $$
   SELECT CASE substring(LOWER($1) FROM 1 FOR 1)
          WHEN 's' THEN '1'::"char"
          WHEN 'u' THEN '2'::"char"
          WHEN 'i' THEN '3'::"char"
          WHEN 'd' THEN '4'::"char"
          ELSE          '0'::"char" END
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _rule_on( NAME, NAME, NAME )
RETURNS "char" AS $$
    SELECT r.ev_type
      FROM pg_catalog.pg_rewrite r
      JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
      JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
     WHERE r.rulename = $3
       AND c.relname  = $2
       AND n.nspname  = $1
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _rule_on( NAME, NAME )
RETURNS "char" AS $$
    SELECT r.ev_type
      FROM pg_catalog.pg_rewrite r
      JOIN pg_catalog.pg_class c     ON c.oid = r.ev_class
     WHERE r.rulename = $2
       AND c.relname  = $1
$$ LANGUAGE SQL;

-- rule_is_on( schema, table, rule, event, description )
CREATE OR REPLACE FUNCTION rule_is_on( NAME, NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    want char := _contract_on($4);
    have char := _rule_on($1, $2, $3);
BEGIN
    IF have IS NOT NULL THEN
        RETURN is( _expand_on(have), _expand_on(want), $5 );
    END IF;

    RETURN ok( false, $5 ) || E'\n' || diag(
        '    Rule ' || quote_ident($3) || ' does not exist on '
        || quote_ident($1) || '.' || quote_ident($2)
    );
END;
$$ LANGUAGE plpgsql;

-- rule_is_on( schema, table, rule, event )
CREATE OR REPLACE FUNCTION rule_is_on( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT rule_is_on(
        $1, $2, $3, $4,
        'Rule ' || quote_ident($3) || ' should be on ' || _expand_on(_contract_on($4)::char)
        || ' to ' || quote_ident($1) || '.' || quote_ident($2)
    );
$$ LANGUAGE SQL;

-- rule_is_on( table, rule, event, description )
CREATE OR REPLACE FUNCTION rule_is_on( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    want char := _contract_on($3);
    have char := _rule_on($1, $2);
BEGIN
    IF have IS NOT NULL THEN
        RETURN is( _expand_on(have), _expand_on(want), $4 );
    END IF;

    RETURN ok( false, $4 ) || E'\n' || diag(
        '    Rule ' || quote_ident($2) || ' does not exist on '
        || quote_ident($1)
    );
END;
$$ LANGUAGE plpgsql;

-- rule_is_on( table, rule, event )
CREATE OR REPLACE FUNCTION rule_is_on( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT rule_is_on(
        $1, $2, $3,
        'Rule ' || quote_ident($2) || ' should be on '
        || _expand_on(_contract_on($3)::char) || ' to ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _nosuch( NAME, NAME, NAME[])
RETURNS TEXT AS $$
    SELECT E'\n' || diag(
        '    Function '
          || CASE WHEN $1 IS NOT NULL THEN quote_ident($1) || '.' ELSE '' END
          || quote_ident($2) || '('
          || array_to_string($3, ', ') || ') does not exist'
    );
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _func_compare( NAME, NAME, NAME[], anyelement, anyelement, TEXT)
RETURNS TEXT AS $$
    SELECT CASE WHEN $4 IS NULL
      THEN ok( FALSE, $6 ) || _nosuch($1, $2, $3)
      ELSE is( $4, $5, $6 )
      END;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _func_compare( NAME, NAME, NAME[], boolean, TEXT)
RETURNS TEXT AS $$
    SELECT CASE WHEN $4 IS NULL
      THEN ok( FALSE, $5 ) || _nosuch($1, $2, $3)
      ELSE ok( $4, $5 )
      END;
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _func_compare( NAME, NAME, anyelement, anyelement, TEXT)
RETURNS TEXT AS $$
    SELECT CASE WHEN $3 IS NULL
      THEN ok( FALSE, $5 ) || _nosuch($1, $2, '{}')
      ELSE is( $3, $4, $5 )
      END;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _func_compare( NAME, NAME, boolean, TEXT)
RETURNS TEXT AS $$
    SELECT CASE WHEN $3 IS NULL
      THEN ok( FALSE, $4 ) || _nosuch($1, $2, '{}')
      ELSE ok( $3, $4 )
      END;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _lang ( NAME, NAME, NAME[] )
RETURNS NAME AS $$
    SELECT l.lanname
      FROM tap_funky f
      JOIN pg_catalog.pg_language l ON f.langoid = l.oid
     WHERE f.schema = $1
       and f.name   = $2
       AND f.args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _lang ( NAME, NAME )
RETURNS NAME AS $$
    SELECT l.lanname
      FROM tap_funky f
      JOIN pg_catalog.pg_language l ON f.langoid = l.oid
     WHERE f.schema = $1
       and f.name   = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _lang ( NAME, NAME[] )
RETURNS NAME AS $$
    SELECT l.lanname
      FROM tap_funky f
      JOIN pg_catalog.pg_language l ON f.langoid = l.oid
     WHERE f.name = $1
       AND f.args = array_to_string($2, ',')
       AND f.is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _lang ( NAME )
RETURNS NAME AS $$
    SELECT l.lanname
      FROM tap_funky f
      JOIN pg_catalog.pg_language l ON f.langoid = l.oid
     WHERE f.name = $1
       AND f.is_visible;
$$ LANGUAGE SQL;

-- function_lang_is( schema, function, args[], language, description )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME, NAME[], NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _lang($1, $2, $3), $4, $5 );
$$ LANGUAGE SQL;

-- function_lang_is( schema, function, args[], language )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME, NAME[], NAME )
RETURNS TEXT AS $$
    SELECT function_lang_is(
        $1, $2, $3, $4,
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be written in ' || quote_ident($4)
    );
$$ LANGUAGE SQL;

-- function_lang_is( schema, function, language, description )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _lang($1, $2), $3, $4 );
$$ LANGUAGE SQL;

-- function_lang_is( schema, function, language )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT function_lang_is(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '.' || quote_ident($2)
        || '() should be written in ' || quote_ident($3)
    );
$$ LANGUAGE SQL;

-- function_lang_is( function, args[], language, description )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME[], NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _lang($1, $2), $3, $4 );
$$ LANGUAGE SQL;

-- function_lang_is( function, args[], language )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME[], NAME )
RETURNS TEXT AS $$
    SELECT function_lang_is(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be written in ' || quote_ident($3)
    );
$$ LANGUAGE SQL;

-- function_lang_is( function, language, description )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _lang($1), $2, $3 );
$$ LANGUAGE SQL;

-- function_lang_is( function, language )
CREATE OR REPLACE FUNCTION function_lang_is( NAME, NAME )
RETURNS TEXT AS $$
    SELECT function_lang_is(
        $1, $2,
        'Function ' || quote_ident($1)
        || '() should be written in ' || quote_ident($2)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _returns ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT returns
      FROM tap_funky
     WHERE schema = $1
       AND name   = $2
       AND args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _returns ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT returns FROM tap_funky WHERE schema = $1 AND name = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _returns ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT returns
      FROM tap_funky
     WHERE name = $1
       AND args = array_to_string($2, ',')
       AND is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _returns ( NAME )
RETURNS TEXT AS $$
    SELECT returns FROM tap_funky WHERE name = $1 AND is_visible;
$$ LANGUAGE SQL;

-- function_returns( schema, function, args[], type, description )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _returns($1, $2, $3), $4, $5 );
$$ LANGUAGE SQL;

-- function_returns( schema, function, args[], type )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT function_returns(
        $1, $2, $3, $4,
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should return ' || $4
    );
$$ LANGUAGE SQL;

-- function_returns( schema, function, type, description )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _returns($1, $2), $3, $4 );
$$ LANGUAGE SQL;

-- function_returns( schema, function, type )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT function_returns(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '.' || quote_ident($2)
        || '() should return ' || $3
    );
$$ LANGUAGE SQL;

-- function_returns( function, args[], type, description )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _returns($1, $2), $3, $4 );
$$ LANGUAGE SQL;

-- function_returns( function, args[], type )
CREATE OR REPLACE FUNCTION function_returns( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT function_returns(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should return ' || $3
    );
$$ LANGUAGE SQL;

-- function_returns( function, type, description )
CREATE OR REPLACE FUNCTION function_returns( NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _returns($1), $2, $3 );
$$ LANGUAGE SQL;

-- function_returns( function, type )
CREATE OR REPLACE FUNCTION function_returns( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT function_returns(
        $1, $2,
        'Function ' || quote_ident($1) || '() should return ' || $2
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _definer ( NAME, NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT is_definer
      FROM tap_funky
     WHERE schema = $1
       AND name   = $2
       AND args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _definer ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT is_definer FROM tap_funky WHERE schema = $1 AND name = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _definer ( NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT is_definer
      FROM tap_funky
     WHERE name = $1
       AND args = array_to_string($2, ',')
       AND is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _definer ( NAME )
RETURNS BOOLEAN AS $$
    SELECT is_definer FROM tap_funky WHERE name = $1 AND is_visible;
$$ LANGUAGE SQL;

-- is_definer( schema, function, args[], description )
CREATE OR REPLACE FUNCTION is_definer ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _definer($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- is_definer( schema, function, args[] )
CREATE OR REPLACE FUNCTION is_definer( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _definer($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be security definer'
    );
$$ LANGUAGE sql;

-- is_definer( schema, function, description )
CREATE OR REPLACE FUNCTION is_definer ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _definer($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_definer( schema, function )
CREATE OR REPLACE FUNCTION is_definer( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _definer($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should be security definer'
    );
$$ LANGUAGE sql;

-- is_definer( function, args[], description )
CREATE OR REPLACE FUNCTION is_definer ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _definer($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_definer( function, args[] )
CREATE OR REPLACE FUNCTION is_definer( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _definer($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be security definer'
    );
$$ LANGUAGE sql;

-- is_definer( function, description )
CREATE OR REPLACE FUNCTION is_definer( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _definer($1), $2 );
$$ LANGUAGE sql;

-- is_definer( function )
CREATE OR REPLACE FUNCTION is_definer( NAME )
RETURNS TEXT AS $$
    SELECT ok( _definer($1), 'Function ' || quote_ident($1) || '() should be security definer' );
$$ LANGUAGE sql;

-- isnt_definer( schema, function, args[], description )
CREATE OR REPLACE FUNCTION isnt_definer ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, NOT _definer($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- isnt_definer( schema, function, args[] )
CREATE OR REPLACE FUNCTION isnt_definer( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _definer($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should not be security definer'
    );
$$ LANGUAGE sql;

-- isnt_definer( schema, function, description )
CREATE OR REPLACE FUNCTION isnt_definer ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, NOT _definer($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_definer( schema, function )
CREATE OR REPLACE FUNCTION isnt_definer( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _definer($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should not be security definer'
    );
$$ LANGUAGE sql;

-- isnt_definer( function, args[], description )
CREATE OR REPLACE FUNCTION isnt_definer ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, NOT _definer($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_definer( function, args[] )
CREATE OR REPLACE FUNCTION isnt_definer( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _definer($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should not be security definer'
    );
$$ LANGUAGE sql;

-- isnt_definer( function, description )
CREATE OR REPLACE FUNCTION isnt_definer( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, NOT _definer($1), $2 );
$$ LANGUAGE sql;

-- isnt_definer( function )
CREATE OR REPLACE FUNCTION isnt_definer( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _definer($1), 'Function ' || quote_ident($1) || '() should not be security definer' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _agg ( NAME, NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT kind = 'a'
      FROM tap_funky
     WHERE schema = $1
       AND name   = $2
       AND args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _agg ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT kind = 'a' FROM tap_funky WHERE schema = $1 AND name = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _agg ( NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT kind = 'a'
      FROM tap_funky
     WHERE name = $1
       AND args = array_to_string($2, ',')
       AND is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _agg ( NAME )
RETURNS BOOLEAN AS $$
    SELECT kind = 'a' FROM tap_funky WHERE name = $1 AND is_visible;
$$ LANGUAGE SQL;

-- is_aggregate( schema, function, args[], description )
CREATE OR REPLACE FUNCTION is_aggregate ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _agg($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- is_aggregate( schema, function, args[] )
CREATE OR REPLACE FUNCTION is_aggregate( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _agg($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be an aggregate function'
    );
$$ LANGUAGE sql;

-- is_aggregate( schema, function, description )
CREATE OR REPLACE FUNCTION is_aggregate ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _agg($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_aggregate( schema, function )
CREATE OR REPLACE FUNCTION is_aggregate( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _agg($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should be an aggregate function'
    );
$$ LANGUAGE sql;

-- is_aggregate( function, args[], description )
CREATE OR REPLACE FUNCTION is_aggregate ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _agg($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_aggregate( function, args[] )
CREATE OR REPLACE FUNCTION is_aggregate( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _agg($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be an aggregate function'
    );
$$ LANGUAGE sql;

-- is_aggregate( function, description )
CREATE OR REPLACE FUNCTION is_aggregate( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _agg($1), $2 );
$$ LANGUAGE sql;

-- is_aggregate( function )
CREATE OR REPLACE FUNCTION is_aggregate( NAME )
RETURNS TEXT AS $$
    SELECT ok( _agg($1), 'Function ' || quote_ident($1) || '() should be an aggregate function' );
$$ LANGUAGE sql;

-- isnt_aggregate( schema, function, args[], description )
CREATE OR REPLACE FUNCTION isnt_aggregate ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, NOT _agg($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- isnt_aggregate( schema, function, args[] )
CREATE OR REPLACE FUNCTION isnt_aggregate( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _agg($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should not be an aggregate function'
    );
$$ LANGUAGE sql;

-- isnt_aggregate( schema, function, description )
CREATE OR REPLACE FUNCTION isnt_aggregate ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, NOT _agg($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_aggregate( schema, function )
CREATE OR REPLACE FUNCTION isnt_aggregate( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _agg($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should not be an aggregate function'
    );
$$ LANGUAGE sql;

-- isnt_aggregate( function, args[], description )
CREATE OR REPLACE FUNCTION isnt_aggregate ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, NOT _agg($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_aggregate( function, args[] )
CREATE OR REPLACE FUNCTION isnt_aggregate( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _agg($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should not be an aggregate function'
    );
$$ LANGUAGE sql;

-- isnt_aggregate( function, description )
CREATE OR REPLACE FUNCTION isnt_aggregate( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, NOT _agg($1), $2 );
$$ LANGUAGE sql;

-- isnt_aggregate( function )
CREATE OR REPLACE FUNCTION isnt_aggregate( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _agg($1), 'Function ' || quote_ident($1) || '() should not be an aggregate function' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _strict ( NAME, NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT is_strict
      FROM tap_funky
     WHERE schema = $1
       AND name   = $2
       AND args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _strict ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT is_strict FROM tap_funky WHERE schema = $1 AND name = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _strict ( NAME, NAME[] )
RETURNS BOOLEAN AS $$
    SELECT is_strict
      FROM tap_funky
     WHERE name = $1
       AND args = array_to_string($2, ',')
       AND is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _strict ( NAME )
RETURNS BOOLEAN AS $$
    SELECT is_strict FROM tap_funky WHERE name = $1 AND is_visible;
$$ LANGUAGE SQL;

-- is_strict( schema, function, args[], description )
CREATE OR REPLACE FUNCTION is_strict ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _strict($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- is_strict( schema, function, args[] )
CREATE OR REPLACE FUNCTION is_strict( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _strict($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be strict'
    );
$$ LANGUAGE sql;

-- is_strict( schema, function, description )
CREATE OR REPLACE FUNCTION is_strict ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _strict($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_strict( schema, function )
CREATE OR REPLACE FUNCTION is_strict( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _strict($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should be strict'
    );
$$ LANGUAGE sql;

-- is_strict( function, args[], description )
CREATE OR REPLACE FUNCTION is_strict ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _strict($1, $2), $3 );
$$ LANGUAGE SQL;

-- is_strict( function, args[] )
CREATE OR REPLACE FUNCTION is_strict( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        _strict($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be strict'
    );
$$ LANGUAGE sql;

-- is_strict( function, description )
CREATE OR REPLACE FUNCTION is_strict( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _strict($1), $2 );
$$ LANGUAGE sql;

-- is_strict( function )
CREATE OR REPLACE FUNCTION is_strict( NAME )
RETURNS TEXT AS $$
    SELECT ok( _strict($1), 'Function ' || quote_ident($1) || '() should be strict' );
$$ LANGUAGE sql;

-- isnt_strict( schema, function, args[], description )
CREATE OR REPLACE FUNCTION isnt_strict ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, NOT _strict($1, $2, $3), $4 );
$$ LANGUAGE SQL;

-- isnt_strict( schema, function, args[] )
CREATE OR REPLACE FUNCTION isnt_strict( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _strict($1, $2, $3),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should not be strict'
    );
$$ LANGUAGE sql;

-- isnt_strict( schema, function, description )
CREATE OR REPLACE FUNCTION isnt_strict ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, NOT _strict($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_strict( schema, function )
CREATE OR REPLACE FUNCTION isnt_strict( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _strict($1, $2),
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '() should not be strict'
    );
$$ LANGUAGE sql;

-- isnt_strict( function, args[], description )
CREATE OR REPLACE FUNCTION isnt_strict ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, NOT _strict($1, $2), $3 );
$$ LANGUAGE SQL;

-- isnt_strict( function, args[] )
CREATE OR REPLACE FUNCTION isnt_strict( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _strict($1, $2),
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should not be strict'
    );
$$ LANGUAGE sql;

-- isnt_strict( function, description )
CREATE OR REPLACE FUNCTION isnt_strict( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, NOT _strict($1), $2 );
$$ LANGUAGE sql;

-- isnt_strict( function )
CREATE OR REPLACE FUNCTION isnt_strict( NAME )
RETURNS TEXT AS $$
    SELECT ok( NOT _strict($1), 'Function ' || quote_ident($1) || '() should not be strict' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _expand_vol( char )
RETURNS TEXT AS $$
   SELECT CASE $1
          WHEN 'i' THEN 'IMMUTABLE'
          WHEN 's' THEN 'STABLE'
          WHEN 'v' THEN 'VOLATILE'
          ELSE          'UNKNOWN' END
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _refine_vol( text )
RETURNS text AS $$
    SELECT _expand_vol(substring(LOWER($1) FROM 1 FOR 1)::char);
$$ LANGUAGE SQL IMMUTABLE;

CREATE OR REPLACE FUNCTION _vol ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _expand_vol(volatility)
      FROM tap_funky f
     WHERE f.schema = $1
       and f.name   = $2
       AND f.args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _vol ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT _expand_vol(volatility) FROM tap_funky f
     WHERE f.schema = $1 and f.name = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _vol ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _expand_vol(volatility)
      FROM tap_funky f
     WHERE f.name = $1
       AND f.args = array_to_string($2, ',')
       AND f.is_visible;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _vol ( NAME )
RETURNS TEXT AS $$
    SELECT _expand_vol(volatility) FROM tap_funky f
     WHERE f.name = $1 AND f.is_visible;
$$ LANGUAGE SQL;

-- volatility_is( schema, function, args[], volatility, description )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, $3, _vol($1, $2, $3), _refine_vol($4), $5 );
$$ LANGUAGE SQL;

-- volatility_is( schema, function, args[], volatility )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT volatility_is(
        $1, $2, $3, $4,
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be ' || _refine_vol($4)
    );
$$ LANGUAGE SQL;

-- volatility_is( schema, function, volatility, description )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare($1, $2, _vol($1, $2), _refine_vol($3), $4 );
$$ LANGUAGE SQL;

-- volatility_is( schema, function, volatility )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT volatility_is(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '.' || quote_ident($2)
        || '() should be ' || _refine_vol($3)
    );
$$ LANGUAGE SQL;

-- volatility_is( function, args[], volatility, description )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME[], TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, $2, _vol($1, $2), _refine_vol($3), $4 );
$$ LANGUAGE SQL;

-- volatility_is( function, args[], volatility )
CREATE OR REPLACE FUNCTION volatility_is( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT volatility_is(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be ' || _refine_vol($3)
    );
$$ LANGUAGE SQL;

-- volatility_is( function, volatility, description )
CREATE OR REPLACE FUNCTION volatility_is( NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _func_compare(NULL, $1, _vol($1), _refine_vol($2), $3 );
$$ LANGUAGE SQL;

-- volatility_is( function, volatility )
CREATE OR REPLACE FUNCTION volatility_is( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT volatility_is(
        $1, $2,
        'Function ' || quote_ident($1) || '() should be ' || _refine_vol($2)
    );
$$ LANGUAGE SQL;

-- check_test( test_output, pass, name, description, diag, match_diag )
CREATE OR REPLACE FUNCTION check_test( TEXT, BOOLEAN, TEXT, TEXT, TEXT, BOOLEAN )
RETURNS SETOF TEXT AS $$
DECLARE
    tnumb   INTEGER;
    aok     BOOLEAN;
    adescr  TEXT;
    res     BOOLEAN;
    descr   TEXT;
    adiag   TEXT;
    have    ALIAS FOR $1;
    eok     ALIAS FOR $2;
    name    ALIAS FOR $3;
    edescr  ALIAS FOR $4;
    ediag   ALIAS FOR $5;
    matchit ALIAS FOR $6;
BEGIN
    -- What test was it that just ran?
    tnumb := currval('__tresults___numb_seq');

    -- Fetch the results.
    aok    := substring(have, 1, 2) = 'ok';
    adescr := COALESCE(substring(have FROM  E'(?:not )?ok [[:digit:]]+ - ([^\n]+)'), '');

    -- Now delete those results.
    EXECUTE 'ALTER SEQUENCE __tresults___numb_seq RESTART WITH ' || tnumb;
    IF NOT aok THEN PERFORM _set('failed', _get('failed') - 1); END IF;

    -- Set up the description.
    descr := coalesce( name || ' ', 'Test ' ) || 'should ';

    -- So, did the test pass?
    RETURN NEXT is(
        aok,
        eok,
        descr || CASE eok WHEN true then 'pass' ELSE 'fail' END
    );

    -- Was the description as expected?
    IF edescr IS NOT NULL THEN
        RETURN NEXT is(
            adescr,
            edescr,
            descr || 'have the proper description'
        );
    END IF;

    -- Were the diagnostics as expected?
    IF ediag IS NOT NULL THEN
        -- Remove ok and the test number.
        adiag := substring(
            have
            FROM CASE WHEN aok THEN 4 ELSE 9 END + char_length(tnumb::text)
        );

        -- Remove the description, if there is one.
        IF adescr <> '' THEN
            adiag := substring(
                adiag FROM 1 + char_length( ' - ' || substr(diag( adescr ), 3) )
            );
        END IF;

        IF NOT aok THEN
            -- Remove failure message from ok().
            adiag := substring(adiag FROM 1 + char_length(diag(
                'Failed test ' || tnumb ||
                CASE adescr WHEN '' THEN '' ELSE COALESCE(': "' || adescr || '"', '') END
            )));
        END IF;

        IF ediag <> '' THEN
           -- Remove the space before the diagnostics.
           adiag := substring(adiag FROM 2);
        END IF;

        -- Remove the #s.
        adiag := replace( substring(adiag from 3), E'\n# ', E'\n' );

        -- Now compare the diagnostics.
        IF matchit THEN
            RETURN NEXT matches(
                adiag,
                ediag,
                descr || 'have the proper diagnostics'
            );
        ELSE
            RETURN NEXT is(
                adiag,
                ediag,
                descr || 'have the proper diagnostics'
            );
        END IF;
    END IF;

    -- And we're done
    RETURN;
END;
$$ LANGUAGE plpgsql;

-- check_test( test_output, pass, name, description, diag )
CREATE OR REPLACE FUNCTION check_test( TEXT, BOOLEAN, TEXT, TEXT, TEXT )
RETURNS SETOF TEXT AS $$
    SELECT * FROM check_test( $1, $2, $3, $4, $5, FALSE );
$$ LANGUAGE sql;

-- check_test( test_output, pass, name, description )
CREATE OR REPLACE FUNCTION check_test( TEXT, BOOLEAN, TEXT, TEXT )
RETURNS SETOF TEXT AS $$
    SELECT * FROM check_test( $1, $2, $3, $4, NULL, FALSE );
$$ LANGUAGE sql;

-- check_test( test_output, pass, name )
CREATE OR REPLACE FUNCTION check_test( TEXT, BOOLEAN, TEXT )
RETURNS SETOF TEXT AS $$
    SELECT * FROM check_test( $1, $2, $3, NULL, NULL, FALSE );
$$ LANGUAGE sql;

-- check_test( test_output, pass )
CREATE OR REPLACE FUNCTION check_test( TEXT, BOOLEAN )
RETURNS SETOF TEXT AS $$
    SELECT * FROM check_test( $1, $2, NULL, NULL, NULL, FALSE );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION findfuncs( NAME, TEXT, TEXT )
RETURNS TEXT[] AS $$
    SELECT ARRAY(
        SELECT DISTINCT (quote_ident(n.nspname) || '.' || quote_ident(p.proname)) COLLATE "C" AS pname
          FROM pg_catalog.pg_proc p
          JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid
         WHERE n.nspname = $1
           AND p.proname ~ $2
           AND ($3 IS NULL OR p.proname !~ $3)
         ORDER BY pname
    );
$$ LANGUAGE sql;
CREATE OR REPLACE FUNCTION findfuncs( NAME, TEXT )
RETURNS TEXT[] AS $$
    SELECT findfuncs( $1, $2, NULL )
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION findfuncs( TEXT, TEXT )
RETURNS TEXT[] AS $$
    SELECT ARRAY(
        SELECT DISTINCT (quote_ident(n.nspname) || '.' || quote_ident(p.proname)) COLLATE "C" AS pname
          FROM pg_catalog.pg_proc p
          JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid
         WHERE pg_catalog.pg_function_is_visible(p.oid)
           AND p.proname ~ $1
           AND ($2 IS NULL OR p.proname !~ $2)
         ORDER BY pname
    );
$$ LANGUAGE sql;
CREATE OR REPLACE FUNCTION findfuncs( TEXT )
RETURNS TEXT[] AS $$
    SELECT findfuncs( $1, NULL )
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _runem( text[], boolean )
RETURNS SETOF TEXT AS $$
DECLARE
    tap    text;
    lbound int := array_lower($1, 1);
BEGIN
    IF lbound IS NULL THEN RETURN; END IF;
    FOR i IN lbound..array_upper($1, 1) LOOP
        -- Send the name of the function to diag if warranted.
        IF $2 THEN RETURN NEXT diag( $1[i] || '()' ); END IF;
        -- Execute the tap function and return its results.
        FOR tap IN EXECUTE 'SELECT * FROM ' || $1[i] || '()' LOOP
            RETURN NEXT tap;
        END LOOP;
    END LOOP;
    RETURN;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _is_verbose()
RETURNS BOOLEAN AS $$
    SELECT current_setting('client_min_messages') NOT IN (
        'warning', 'error', 'fatal', 'panic'
    );
$$ LANGUAGE sql STABLE;

-- do_tap( schema, pattern )
CREATE OR REPLACE FUNCTION do_tap( name, text )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runem( findfuncs($1, $2), _is_verbose() );
$$ LANGUAGE sql;

-- do_tap( schema )
CREATE OR REPLACE FUNCTION do_tap( name )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runem( findfuncs($1, '^test'), _is_verbose() );
$$ LANGUAGE sql;

-- do_tap( pattern )
CREATE OR REPLACE FUNCTION do_tap( text )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runem( findfuncs($1), _is_verbose() );
$$ LANGUAGE sql;

-- do_tap()
CREATE OR REPLACE FUNCTION do_tap( )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runem( findfuncs('^test'), _is_verbose());
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _currtest()
RETURNS INTEGER AS $$
BEGIN
    RETURN currval('__tresults___numb_seq');
EXCEPTION
    WHEN object_not_in_prerequisite_state THEN RETURN 0;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _cleanup()
RETURNS boolean AS $$
    DROP SEQUENCE __tresults___numb_seq;
    DROP TABLE __tcache__;
    DROP SEQUENCE __tcache___id_seq;
    SELECT TRUE;
$$ LANGUAGE sql;

-- diag_test_name ( test_name )
CREATE OR REPLACE FUNCTION diag_test_name(TEXT)
RETURNS TEXT AS $$
    SELECT diag($1 || '()');
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _runner( text[], text[], text[], text[], text[] )
RETURNS SETOF TEXT AS $$
DECLARE
    startup  ALIAS FOR $1;
    shutdown ALIAS FOR $2;
    setup    ALIAS FOR $3;
    teardown ALIAS FOR $4;
    tests    ALIAS FOR $5;
    tap      TEXT;
    tfaild   INTEGER := 0;
    ffaild   INTEGER := 0;
    tnumb    INTEGER := 0;
    fnumb    INTEGER := 0;
    tok      BOOLEAN := TRUE;
BEGIN
    BEGIN
        -- No plan support.
        PERFORM * FROM no_plan();
        FOR tap IN SELECT * FROM _runem(startup, false) LOOP RETURN NEXT tap; END LOOP;
    EXCEPTION
        -- Catch all exceptions and simply rethrow custom exceptions. This
        -- will roll back everything in the above block.
        WHEN raise_exception THEN RAISE EXCEPTION '%', SQLERRM;
    END;

    -- Record how startup tests have failed.
    tfaild := num_failed();

    FOR i IN 1..COALESCE(array_upper(tests, 1), 0) LOOP

        -- What subtest are we running?
        RETURN NEXT '    ' || diag_test_name('Subtest: ' || tests[i]);

        -- Reset the results.
        tok := TRUE;
        tnumb := COALESCE(_get('curr_test'), 0);

        IF tnumb > 0 THEN
            EXECUTE 'ALTER SEQUENCE __tresults___numb_seq RESTART WITH 1';
            PERFORM _set('curr_test', 0);
            PERFORM _set('failed', 0);
        END IF;

        DECLARE
            errstate text;
            errmsg   text;
            detail   text;
            hint     text;
            context  text;
            schname  text;
            tabname  text;
            colname  text;
            chkname  text;
            typname  text;
        BEGIN
            BEGIN
                -- Run the setup functions.
                FOR tap IN SELECT * FROM _runem(setup, false) LOOP
                    RETURN NEXT regexp_replace(tap, '^', '    ', 'gn');
                END LOOP;

                -- Run the actual test function.
                FOR tap IN EXECUTE 'SELECT * FROM ' || tests[i] || '()' LOOP
                    RETURN NEXT regexp_replace(tap, '^', '    ', 'gn');
                END LOOP;

                -- Run the teardown functions.
                FOR tap IN SELECT * FROM _runem(teardown, false) LOOP
                    RETURN NEXT regexp_replace(tap, '^', '    ', 'gn');
                END LOOP;

                -- Emit the plan.
                fnumb := COALESCE(_get('curr_test'), 0);
                RETURN NEXT '    1..' || fnumb;

                -- Emit any error messages.
                IF fnumb = 0 THEN
                    RETURN NEXT '    # No tests run!';
                    tok = false;
                ELSE
                    -- Report failures.
                    ffaild := num_failed();
                    IF ffaild > 0 THEN
                        tok := FALSE;
                        RETURN NEXT '    ' || diag(
                            'Looks like you failed ' || ffaild || ' test' ||
                             CASE tfaild WHEN 1 THEN '' ELSE 's' END
                             || ' of ' || fnumb
                        );
                    END IF;
                END IF;

            EXCEPTION WHEN raise_exception THEN
                -- Something went wrong. Record that fact.
                errstate := SQLSTATE;
                errmsg := SQLERRM;
                GET STACKED DIAGNOSTICS
                    detail  = PG_EXCEPTION_DETAIL,
                    hint    = PG_EXCEPTION_HINT,
                    context = PG_EXCEPTION_CONTEXT,
                    schname = SCHEMA_NAME,
                    tabname = TABLE_NAME,
                    colname = COLUMN_NAME,
                    chkname = CONSTRAINT_NAME,
                    typname = PG_DATATYPE_NAME;
            END;

            -- Always raise an exception to rollback any changes.
            RAISE EXCEPTION '__TAP_ROLLBACK__';

        EXCEPTION WHEN raise_exception THEN
            IF errmsg IS NOT NULL THEN
                -- Something went wrong. Emit the error message.
                tok := FALSE;
               RETURN NEXT regexp_replace( diag('Test died: ' || _error_diag(
                   errstate, errmsg, detail, hint, context, schname, tabname, colname, chkname, typname
               )), '^', '    ', 'gn');
                errmsg := NULL;
            END IF;
        END;

        -- Restore the sequence.
        EXECUTE 'ALTER SEQUENCE __tresults___numb_seq RESTART WITH ' || tnumb + 1;
        PERFORM _set('curr_test', tnumb);
        PERFORM _set('failed', tfaild);

        -- Record this test.
        RETURN NEXT ok(tok, tests[i]);
        IF NOT tok THEN tfaild := tfaild + 1; END IF;

    END LOOP;

    -- Run the shutdown functions.
    FOR tap IN SELECT * FROM _runem(shutdown, false) LOOP RETURN NEXT tap; END LOOP;

    -- Finish up.
    FOR tap IN SELECT * FROM _finish( COALESCE(_get('curr_test'), 0), 0, tfaild ) LOOP
        RETURN NEXT tap;
    END LOOP;

    -- Clean up and return.
    PERFORM _cleanup();
    RETURN;
END;
$$ LANGUAGE plpgsql;

-- runtests( schema, match )
CREATE OR REPLACE FUNCTION runtests( NAME, TEXT )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runner(
        findfuncs( $1, '^startup' ),
        findfuncs( $1, '^shutdown' ),
        findfuncs( $1, '^setup' ),
        findfuncs( $1, '^teardown' ),
        findfuncs( $1, $2, '^(startup|shutdown|setup|teardown)' )
    );
$$ LANGUAGE sql;

-- runtests( schema )
CREATE OR REPLACE FUNCTION runtests( NAME )
RETURNS SETOF TEXT AS $$
    SELECT * FROM runtests( $1, '^test' );
$$ LANGUAGE sql;

-- runtests( match )
CREATE OR REPLACE FUNCTION runtests( TEXT )
RETURNS SETOF TEXT AS $$
    SELECT * FROM _runner(
        findfuncs( '^startup' ),
        findfuncs( '^shutdown' ),
        findfuncs( '^setup' ),
        findfuncs( '^teardown' ),
        findfuncs( $1, '^(startup|shutdown|setup|teardown)' )
    );
$$ LANGUAGE sql;

-- runtests( )
CREATE OR REPLACE FUNCTION runtests( )
RETURNS SETOF TEXT AS $$
    SELECT * FROM runtests( '^test' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _temptable ( TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    EXECUTE 'CREATE TEMP TABLE ' || $2 || ' AS ' || _query($1);
    return $2;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _temptable ( anyarray, TEXT )
RETURNS TEXT AS $$
BEGIN
    CREATE TEMP TABLE _____coltmp___ AS
    SELECT $1[i]
    FROM generate_series(array_lower($1, 1), array_upper($1, 1)) s(i);
    EXECUTE 'ALTER TABLE _____coltmp___ RENAME TO ' || $2;
    return $2;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _temptypes( TEXT )
RETURNS TEXT AS $$
    SELECT array_to_string(ARRAY(
        SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
          FROM pg_catalog.pg_attribute a
          JOIN pg_catalog.pg_class c ON a.attrelid = c.oid
         WHERE c.oid = ('pg_temp.' || $1)::pg_catalog.regclass
           AND attnum > 0
           AND NOT attisdropped
         ORDER BY attnum
    ), ',');
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _docomp( TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have    ALIAS FOR $1;
    want    ALIAS FOR $2;
    extras  TEXT[]  := '{}';
    missing TEXT[]  := '{}';
    res     BOOLEAN := TRUE;
    msg     TEXT    := '';
    rec     RECORD;
BEGIN
    BEGIN
        -- Find extra records.
        FOR rec in EXECUTE 'SELECT * FROM ' || have || ' EXCEPT ' || $4
                        || 'SELECT * FROM ' || want LOOP
            extras := extras || rec::text;
        END LOOP;

        -- Find missing records.
        FOR rec in EXECUTE 'SELECT * FROM ' || want || ' EXCEPT ' || $4
                        || 'SELECT * FROM ' || have LOOP
            missing := missing || rec::text;
        END LOOP;

        -- Drop the temporary tables.
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
    EXCEPTION WHEN syntax_error OR datatype_mismatch THEN
        msg := E'\n' || diag(
            E'    Columns differ between queries:\n'
            || '        have: (' || _temptypes(have) || E')\n'
            || '        want: (' || _temptypes(want) || ')'
        );
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
        RETURN ok(FALSE, $3) || msg;
    END;

    -- What extra records do we have?
    IF extras[1] IS NOT NULL THEN
        res := FALSE;
        msg := E'\n' || diag(
            E'    Extra records:\n        '
            ||  array_to_string( extras, E'\n        ' )
        );
    END IF;

    -- What missing records do we have?
    IF missing[1] IS NOT NULL THEN
        res := FALSE;
        msg := msg || E'\n' || diag(
            E'    Missing records:\n        '
            ||  array_to_string( missing, E'\n        ' )
        );
    END IF;

    RETURN ok(res, $3) || msg;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _relcomp( TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _docomp(
        _temptable( $1, '__taphave__' ),
        _temptable( $2, '__tapwant__' ),
        $3, $4
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _relcomp( TEXT, anyarray, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _docomp(
        _temptable( $1, '__taphave__' ),
        _temptable( $2, '__tapwant__' ),
        $3, $4
    );
$$ LANGUAGE sql;

-- set_eq( sql, sql, description )
CREATE OR REPLACE FUNCTION set_eq( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, '' );
$$ LANGUAGE sql;

-- set_eq( sql, sql )
CREATE OR REPLACE FUNCTION set_eq( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::text, '' );
$$ LANGUAGE sql;

-- set_eq( sql, array, description )
CREATE OR REPLACE FUNCTION set_eq( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, '' );
$$ LANGUAGE sql;

-- set_eq( sql, array )
CREATE OR REPLACE FUNCTION set_eq( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::text, '' );
$$ LANGUAGE sql;

-- bag_eq( sql, sql, description )
CREATE OR REPLACE FUNCTION bag_eq( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'ALL ' );
$$ LANGUAGE sql;

-- bag_eq( sql, sql )
CREATE OR REPLACE FUNCTION bag_eq( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::text, 'ALL ' );
$$ LANGUAGE sql;

-- bag_eq( sql, array, description )
CREATE OR REPLACE FUNCTION bag_eq( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'ALL ' );
$$ LANGUAGE sql;

-- bag_eq( sql, array )
CREATE OR REPLACE FUNCTION bag_eq( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::text, 'ALL ' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _do_ne( TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have    ALIAS FOR $1;
    want    ALIAS FOR $2;
    extras  TEXT[]  := '{}';
    missing TEXT[]  := '{}';
    res     BOOLEAN := TRUE;
    msg     TEXT    := '';
BEGIN
    BEGIN
        -- Find extra records.
        EXECUTE 'SELECT EXISTS ( '
             || '( SELECT * FROM ' || have || ' EXCEPT ' || $4
             || '  SELECT * FROM ' || want
             || ' ) UNION ( '
             || '  SELECT * FROM ' || want || ' EXCEPT ' || $4
             || '  SELECT * FROM ' || have
             || ' ) LIMIT 1 )' INTO res;

        -- Drop the temporary tables.
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
    EXCEPTION WHEN syntax_error OR datatype_mismatch THEN
        msg := E'\n' || diag(
            E'    Columns differ between queries:\n'
            || '        have: (' || _temptypes(have) || E')\n'
            || '        want: (' || _temptypes(want) || ')'
        );
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
        RETURN ok(FALSE, $3) || msg;
    END;

    -- Return the value from the query.
    RETURN ok(res, $3);
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _relne( TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _do_ne(
        _temptable( $1, '__taphave__' ),
        _temptable( $2, '__tapwant__' ),
        $3, $4
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _relne( TEXT, anyarray, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _do_ne(
        _temptable( $1, '__taphave__' ),
        _temptable( $2, '__tapwant__' ),
        $3, $4
    );
$$ LANGUAGE sql;

-- set_ne( sql, sql, description )
CREATE OR REPLACE FUNCTION set_ne( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, $3, '' );
$$ LANGUAGE sql;

-- set_ne( sql, sql )
CREATE OR REPLACE FUNCTION set_ne( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, NULL::text, '' );
$$ LANGUAGE sql;

-- set_ne( sql, array, description )
CREATE OR REPLACE FUNCTION set_ne( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, $3, '' );
$$ LANGUAGE sql;

-- set_ne( sql, array )
CREATE OR REPLACE FUNCTION set_ne( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, NULL::text, '' );
$$ LANGUAGE sql;

-- bag_ne( sql, sql, description )
CREATE OR REPLACE FUNCTION bag_ne( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, $3, 'ALL ' );
$$ LANGUAGE sql;

-- bag_ne( sql, sql )
CREATE OR REPLACE FUNCTION bag_ne( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, NULL::text, 'ALL ' );
$$ LANGUAGE sql;

-- bag_ne( sql, array, description )
CREATE OR REPLACE FUNCTION bag_ne( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, $3, 'ALL ' );
$$ LANGUAGE sql;

-- bag_ne( sql, array )
CREATE OR REPLACE FUNCTION bag_ne( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT _relne( $1, $2, NULL::text, 'ALL ' );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _relcomp( TEXT, TEXT, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have    TEXT    := _temptable( $1, '__taphave__' );
    want    TEXT    := _temptable( $2, '__tapwant__' );
    results TEXT[]  := '{}';
    res     BOOLEAN := TRUE;
    msg     TEXT    := '';
    rec     RECORD;
BEGIN
    BEGIN
        -- Find relevant records.
        FOR rec in EXECUTE 'SELECT * FROM ' || want || ' ' || $4
                       || ' SELECT * FROM ' || have LOOP
            results := results || rec::text;
        END LOOP;

        -- Drop the temporary tables.
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
    EXCEPTION WHEN syntax_error OR datatype_mismatch THEN
        msg := E'\n' || diag(
            E'    Columns differ between queries:\n'
            || '        have: (' || _temptypes(have) || E')\n'
            || '        want: (' || _temptypes(want) || ')'
        );
        EXECUTE 'DROP TABLE ' || have;
        EXECUTE 'DROP TABLE ' || want;
        RETURN ok(FALSE, $3) || msg;
    END;

    -- What records do we have?
    IF results[1] IS NOT NULL THEN
        res := FALSE;
        msg := msg || E'\n' || diag(
            '    ' || $5 || E' records:\n        '
            ||  array_to_string( results, E'\n        ' )
        );
    END IF;

    RETURN ok(res, $3) || msg;
END;
$$ LANGUAGE plpgsql;

-- set_has( sql, sql, description )
CREATE OR REPLACE FUNCTION set_has( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'EXCEPT', 'Missing' );
$$ LANGUAGE sql;

-- set_has( sql, sql )
CREATE OR REPLACE FUNCTION set_has( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::TEXT, 'EXCEPT', 'Missing' );
$$ LANGUAGE sql;

-- bag_has( sql, sql, description )
CREATE OR REPLACE FUNCTION bag_has( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'EXCEPT ALL', 'Missing' );
$$ LANGUAGE sql;

-- bag_has( sql, sql )
CREATE OR REPLACE FUNCTION bag_has( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::TEXT, 'EXCEPT ALL', 'Missing' );
$$ LANGUAGE sql;

-- set_hasnt( sql, sql, description )
CREATE OR REPLACE FUNCTION set_hasnt( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'INTERSECT', 'Extra' );
$$ LANGUAGE sql;

-- set_hasnt( sql, sql )
CREATE OR REPLACE FUNCTION set_hasnt( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::TEXT, 'INTERSECT', 'Extra' );
$$ LANGUAGE sql;

-- bag_hasnt( sql, sql, description )
CREATE OR REPLACE FUNCTION bag_hasnt( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, $3, 'INTERSECT ALL', 'Extra' );
$$ LANGUAGE sql;

-- bag_hasnt( sql, sql )
CREATE OR REPLACE FUNCTION bag_hasnt( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT _relcomp( $1, $2, NULL::TEXT, 'INTERSECT ALL', 'Extra' );
$$ LANGUAGE sql;

-- results_eq( cursor, cursor, description )
CREATE OR REPLACE FUNCTION results_eq( refcursor, refcursor, text )
RETURNS TEXT AS $$
DECLARE
    have       ALIAS FOR $1;
    want       ALIAS FOR $2;
    have_rec   RECORD;
    want_rec   RECORD;
    have_found BOOLEAN;
    want_found BOOLEAN;
    rownum     INTEGER := 1;
BEGIN
    FETCH have INTO have_rec;
    have_found := FOUND;
    FETCH want INTO want_rec;
    want_found := FOUND;
    WHILE have_found OR want_found LOOP
        IF have_rec IS DISTINCT FROM want_rec OR have_found <> want_found THEN
            RETURN ok( false, $3 ) || E'\n' || diag(
                '    Results differ beginning at row ' || rownum || E':\n' ||
                '        have: ' || CASE WHEN have_found THEN have_rec::text ELSE 'NULL' END || E'\n' ||
                '        want: ' || CASE WHEN want_found THEN want_rec::text ELSE 'NULL' END
            );
        END IF;
        rownum = rownum + 1;
        FETCH have INTO have_rec;
        have_found := FOUND;
        FETCH want INTO want_rec;
        want_found := FOUND;
    END LOOP;

    RETURN ok( true, $3 );
EXCEPTION
    WHEN datatype_mismatch THEN
        RETURN ok( false, $3 ) || E'\n' || diag(
            E'    Number of columns or their types differ between the queries' ||
            CASE WHEN have_rec::TEXT = want_rec::text THEN '' ELSE E':\n' ||
                '        have: ' || CASE WHEN have_found THEN have_rec::text ELSE 'NULL' END || E'\n' ||
                '        want: ' || CASE WHEN want_found THEN want_rec::text ELSE 'NULL' END
            END
        );
END;
$$ LANGUAGE plpgsql;

-- results_eq( cursor, cursor )
CREATE OR REPLACE FUNCTION results_eq( refcursor, refcursor )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_eq( sql, sql, description )
CREATE OR REPLACE FUNCTION results_eq( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    OPEN want FOR EXECUTE _query($2);
    res := results_eq(have, want, $3);
    CLOSE have;
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_eq( sql, sql )
CREATE OR REPLACE FUNCTION results_eq( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_eq( sql, array, description )
CREATE OR REPLACE FUNCTION results_eq( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    OPEN want FOR SELECT $2[i]
    FROM generate_series(array_lower($2, 1), array_upper($2, 1)) s(i);
    res := results_eq(have, want, $3);
    CLOSE have;
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_eq( sql, array )
CREATE OR REPLACE FUNCTION results_eq( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_eq( sql, cursor, description )
CREATE OR REPLACE FUNCTION results_eq( TEXT, refcursor, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    res := results_eq(have, $2, $3);
    CLOSE have;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_eq( sql, cursor )
CREATE OR REPLACE FUNCTION results_eq( TEXT, refcursor )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_eq( cursor, sql, description )
CREATE OR REPLACE FUNCTION results_eq( refcursor, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN want FOR EXECUTE _query($2);
    res := results_eq($1, want, $3);
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_eq( cursor, sql )
CREATE OR REPLACE FUNCTION results_eq( refcursor, TEXT )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_eq( cursor, array, description )
CREATE OR REPLACE FUNCTION results_eq( refcursor, anyarray, TEXT )
RETURNS TEXT AS $$
DECLARE
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN want FOR SELECT $2[i]
    FROM generate_series(array_lower($2, 1), array_upper($2, 1)) s(i);
    res := results_eq($1, want, $3);
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_eq( cursor, array )
CREATE OR REPLACE FUNCTION results_eq( refcursor, anyarray )
RETURNS TEXT AS $$
    SELECT results_eq( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( cursor, cursor, description )
CREATE OR REPLACE FUNCTION results_ne( refcursor, refcursor, text )
RETURNS TEXT AS $$
DECLARE
    have       ALIAS FOR $1;
    want       ALIAS FOR $2;
    have_rec   RECORD;
    want_rec   RECORD;
    have_found BOOLEAN;
    want_found BOOLEAN;
BEGIN
    FETCH have INTO have_rec;
    have_found := FOUND;
    FETCH want INTO want_rec;
    want_found := FOUND;
    WHILE have_found OR want_found LOOP
        IF have_rec IS DISTINCT FROM want_rec OR have_found <> want_found THEN
            RETURN ok( true, $3 );
        ELSE
            FETCH have INTO have_rec;
            have_found := FOUND;
            FETCH want INTO want_rec;
            want_found := FOUND;
        END IF;
    END LOOP;
    RETURN ok( false, $3 );
EXCEPTION
    WHEN datatype_mismatch THEN
        RETURN ok( false, $3 ) || E'\n' || diag(
            E'    Columns differ between queries:\n' ||
            '        have: ' || CASE WHEN have_found THEN have_rec::text ELSE 'NULL' END || E'\n' ||
            '        want: ' || CASE WHEN want_found THEN want_rec::text ELSE 'NULL' END
        );
END;
$$ LANGUAGE plpgsql;

-- results_ne( cursor, cursor )
CREATE OR REPLACE FUNCTION results_ne( refcursor, refcursor )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( sql, sql, description )
CREATE OR REPLACE FUNCTION results_ne( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    OPEN want FOR EXECUTE _query($2);
    res := results_ne(have, want, $3);
    CLOSE have;
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_ne( sql, sql )
CREATE OR REPLACE FUNCTION results_ne( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( sql, array, description )
CREATE OR REPLACE FUNCTION results_ne( TEXT, anyarray, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    OPEN want FOR SELECT $2[i]
    FROM generate_series(array_lower($2, 1), array_upper($2, 1)) s(i);
    res := results_ne(have, want, $3);
    CLOSE have;
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_ne( sql, array )
CREATE OR REPLACE FUNCTION results_ne( TEXT, anyarray )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( sql, cursor, description )
CREATE OR REPLACE FUNCTION results_ne( TEXT, refcursor, TEXT )
RETURNS TEXT AS $$
DECLARE
    have REFCURSOR;
    res  TEXT;
BEGIN
    OPEN have FOR EXECUTE _query($1);
    res := results_ne(have, $2, $3);
    CLOSE have;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_ne( sql, cursor )
CREATE OR REPLACE FUNCTION results_ne( TEXT, refcursor )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( cursor, sql, description )
CREATE OR REPLACE FUNCTION results_ne( refcursor, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN want FOR EXECUTE _query($2);
    res := results_ne($1, want, $3);
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_ne( cursor, sql )
CREATE OR REPLACE FUNCTION results_ne( refcursor, TEXT )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- results_ne( cursor, array, description )
CREATE OR REPLACE FUNCTION results_ne( refcursor, anyarray, TEXT )
RETURNS TEXT AS $$
DECLARE
    want REFCURSOR;
    res  TEXT;
BEGIN
    OPEN want FOR SELECT $2[i]
    FROM generate_series(array_lower($2, 1), array_upper($2, 1)) s(i);
    res := results_ne($1, want, $3);
    CLOSE want;
    RETURN res;
END;
$$ LANGUAGE plpgsql;

-- results_ne( cursor, array )
CREATE OR REPLACE FUNCTION results_ne( refcursor, anyarray )
RETURNS TEXT AS $$
    SELECT results_ne( $1, $2, NULL::text );
$$ LANGUAGE sql;

-- isa_ok( value, regtype, description )
CREATE OR REPLACE FUNCTION isa_ok( anyelement, regtype, TEXT )
RETURNS TEXT AS $$
DECLARE
    typeof regtype := pg_typeof($1);
BEGIN
    IF typeof = $2 THEN RETURN ok(true, $3 || ' isa ' || $2 ); END IF;
    RETURN ok(false, $3 || ' isa ' || $2 ) || E'\n' ||
        diag('    ' || $3 || ' isn''t a "' || $2 || '" it''s a "' || typeof || '"');
END;
$$ LANGUAGE plpgsql;

-- isa_ok( value, regtype )
CREATE OR REPLACE FUNCTION isa_ok( anyelement, regtype )
RETURNS TEXT AS $$
    SELECT isa_ok($1, $2, 'the value');
$$ LANGUAGE sql;

-- is_empty( sql, description )
CREATE OR REPLACE FUNCTION is_empty( TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    extras  TEXT[]  := '{}';
    res     BOOLEAN := TRUE;
    msg     TEXT    := '';
    rec     RECORD;
BEGIN
    -- Find extra records.
    FOR rec in EXECUTE _query($1) LOOP
        extras := extras || rec::text;
    END LOOP;

    -- What extra records do we have?
    IF extras[1] IS NOT NULL THEN
        res := FALSE;
        msg := E'\n' || diag(
            E'    Unexpected records:\n        '
            ||  array_to_string( extras, E'\n        ' )
        );
    END IF;

    RETURN ok(res, $2) || msg;
END;
$$ LANGUAGE plpgsql;

-- is_empty( sql )
CREATE OR REPLACE FUNCTION is_empty( TEXT )
RETURNS TEXT AS $$
    SELECT is_empty( $1, NULL );
$$ LANGUAGE sql;

-- isnt_empty( sql, description )
CREATE OR REPLACE FUNCTION isnt_empty( TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    res  BOOLEAN := FALSE;
    rec  RECORD;
BEGIN
    -- Find extra records.
    FOR rec in EXECUTE _query($1) LOOP
        res := TRUE;
        EXIT;
    END LOOP;

    RETURN ok(res, $2);
END;
$$ LANGUAGE plpgsql;

-- isnt_empty( sql )
CREATE OR REPLACE FUNCTION isnt_empty( TEXT )
RETURNS TEXT AS $$
    SELECT isnt_empty( $1, NULL );
$$ LANGUAGE sql;

-- collect_tap( tap, tap, tap )
CREATE OR REPLACE FUNCTION collect_tap( VARIADIC text[] )
RETURNS TEXT AS $$
    SELECT array_to_string($1, E'\n');
$$ LANGUAGE sql;

-- collect_tap( tap[] )
CREATE OR REPLACE FUNCTION collect_tap( VARCHAR[] )
RETURNS TEXT AS $$
    SELECT array_to_string($1, E'\n');
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _tlike ( BOOLEAN, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( $1, $4 ) || CASE WHEN $1 THEN '' ELSE E'\n' || diag(
           '   error message: ' || COALESCE( quote_literal($2), 'NULL' ) ||
       E'\n   doesn''t match: ' || COALESCE( quote_literal($3), 'NULL' )
    ) END;
$$ LANGUAGE sql;

-- throws_like ( sql, pattern, description )
CREATE OR REPLACE FUNCTION throws_like ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    EXECUTE _query($1);
    RETURN ok( FALSE, $3 ) || E'\n' || diag( '    no exception thrown' );
EXCEPTION WHEN OTHERS THEN
    return _tlike( SQLERRM ~~ $2, SQLERRM, $2, $3 );
END;
$$ LANGUAGE plpgsql;

-- throws_like ( sql, pattern )
CREATE OR REPLACE FUNCTION throws_like ( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT throws_like($1, $2, 'Should throw exception like ' || quote_literal($2) );
$$ LANGUAGE sql;

-- throws_ilike ( sql, pattern, description )
CREATE OR REPLACE FUNCTION throws_ilike ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    EXECUTE _query($1);
    RETURN ok( FALSE, $3 ) || E'\n' || diag( '    no exception thrown' );
EXCEPTION WHEN OTHERS THEN
    return _tlike( SQLERRM ~~* $2, SQLERRM, $2, $3 );
END;
$$ LANGUAGE plpgsql;

-- throws_ilike ( sql, pattern )
CREATE OR REPLACE FUNCTION throws_ilike ( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT throws_ilike($1, $2, 'Should throw exception like ' || quote_literal($2) );
$$ LANGUAGE sql;

-- throws_matching ( sql, pattern, description )
CREATE OR REPLACE FUNCTION throws_matching ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    EXECUTE _query($1);
    RETURN ok( FALSE, $3 ) || E'\n' || diag( '    no exception thrown' );
EXCEPTION WHEN OTHERS THEN
    return _tlike( SQLERRM ~ $2, SQLERRM, $2, $3 );
END;
$$ LANGUAGE plpgsql;

-- throws_matching ( sql, pattern )
CREATE OR REPLACE FUNCTION throws_matching ( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT throws_matching($1, $2, 'Should throw exception matching ' || quote_literal($2) );
$$ LANGUAGE sql;

-- throws_imatching ( sql, pattern, description )
CREATE OR REPLACE FUNCTION throws_imatching ( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
BEGIN
    EXECUTE _query($1);
    RETURN ok( FALSE, $3 ) || E'\n' || diag( '    no exception thrown' );
EXCEPTION WHEN OTHERS THEN
    return _tlike( SQLERRM ~* $2, SQLERRM, $2, $3 );
END;
$$ LANGUAGE plpgsql;

-- throws_imatching ( sql, pattern )
CREATE OR REPLACE FUNCTION throws_imatching ( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT throws_imatching($1, $2, 'Should throw exception matching ' || quote_literal($2) );
$$ LANGUAGE sql;

-- roles_are( roles[], description )
CREATE OR REPLACE FUNCTION roles_are( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'roles',
        ARRAY(
            SELECT rolname
              FROM pg_catalog.pg_roles
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT rolname
              FROM pg_catalog.pg_roles
        ),
        $2
    );
$$ LANGUAGE SQL;

-- roles_are( roles[] )
CREATE OR REPLACE FUNCTION roles_are( NAME[] )
RETURNS TEXT AS $$
    SELECT roles_are( $1, 'There should be the correct roles' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _types_are ( NAME, NAME[], TEXT, CHAR[] )
RETURNS TEXT AS $$
    SELECT _are(
        'types',
        ARRAY(
            SELECT t.typname
              FROM pg_catalog.pg_type t
              LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
             WHERE (
                     t.typrelid = 0
                 OR (SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid)
             )
               AND NOT EXISTS(SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = t.typelem AND el.typarray = t.oid)
               AND n.nspname = $1
               AND t.typtype = ANY( COALESCE($4, ARRAY['b', 'c', 'd', 'p', 'e']) )
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
               FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT t.typname
              FROM pg_catalog.pg_type t
              LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
             WHERE (
                     t.typrelid = 0
                 OR (SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid)
             )
               AND NOT EXISTS(SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = t.typelem AND el.typarray = t.oid)
               AND n.nspname = $1
               AND t.typtype = ANY( COALESCE($4, ARRAY['b', 'c', 'd', 'p', 'e']) )
        ),
        $3
    );
$$ LANGUAGE SQL;

-- types_are( schema, types[], description )
CREATE OR REPLACE FUNCTION types_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, $3, NULL );
$$ LANGUAGE SQL;

-- types_are( schema, types[] )
CREATE OR REPLACE FUNCTION types_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, 'Schema ' || quote_ident($1) || ' should have the correct types', NULL );
$$ LANGUAGE SQL;

-- types_are( types[], description )
CREATE OR REPLACE FUNCTION _types_are ( NAME[], TEXT, CHAR[] )
RETURNS TEXT AS $$
    SELECT _are(
        'types',
        ARRAY(
            SELECT t.typname
              FROM pg_catalog.pg_type t
              LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
             WHERE (
                     t.typrelid = 0
                 OR (SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid)
             )
               AND NOT EXISTS(SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = t.typelem AND el.typarray = t.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_type_is_visible(t.oid)
               AND t.typtype = ANY( COALESCE($3, ARRAY['b', 'c', 'd', 'p', 'e']) )
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
               FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT t.typname
              FROM pg_catalog.pg_type t
              LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
             WHERE (
                     t.typrelid = 0
                 OR (SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid)
             )
               AND NOT EXISTS(SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = t.typelem AND el.typarray = t.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_type_is_visible(t.oid)
               AND t.typtype = ANY( COALESCE($3, ARRAY['b', 'c', 'd', 'p', 'e']) )
        ),
        $2
    );
$$ LANGUAGE SQL;


-- types_are( types[], description )
CREATE OR REPLACE FUNCTION types_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, NULL );
$$ LANGUAGE SQL;

-- types_are( types[] )
CREATE OR REPLACE FUNCTION types_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, 'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct types', NULL );
$$ LANGUAGE SQL;

-- domains_are( schema, domains[], description )
CREATE OR REPLACE FUNCTION domains_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, $3, ARRAY['d'] );
$$ LANGUAGE SQL;

-- domains_are( schema, domains[] )
CREATE OR REPLACE FUNCTION domains_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, 'Schema ' || quote_ident($1) || ' should have the correct domains', ARRAY['d'] );
$$ LANGUAGE SQL;

-- domains_are( domains[], description )
CREATE OR REPLACE FUNCTION domains_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, ARRAY['d'] );
$$ LANGUAGE SQL;

-- domains_are( domains[] )
CREATE OR REPLACE FUNCTION domains_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, 'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct domains', ARRAY['d'] );
$$ LANGUAGE SQL;

-- enums_are( schema, enums[], description )
CREATE OR REPLACE FUNCTION enums_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, $3, ARRAY['e'] );
$$ LANGUAGE SQL;

-- enums_are( schema, enums[] )
CREATE OR REPLACE FUNCTION enums_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, 'Schema ' || quote_ident($1) || ' should have the correct enums', ARRAY['e'] );
$$ LANGUAGE SQL;

-- enums_are( enums[], description )
CREATE OR REPLACE FUNCTION enums_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _types_are( $1, $2, ARRAY['e'] );
$$ LANGUAGE SQL;

-- enums_are( enums[] )
CREATE OR REPLACE FUNCTION enums_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _types_are( $1, 'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct enums', ARRAY['e'] );
$$ LANGUAGE SQL;

-- _dexists( schema, domain )
CREATE OR REPLACE FUNCTION _dexists ( NAME, NAME )
RETURNS BOOLEAN AS $$
   SELECT EXISTS(
       SELECT true
         FROM pg_catalog.pg_namespace n
         JOIN pg_catalog.pg_type t on n.oid = t.typnamespace
        WHERE n.nspname = $1
          AND t.typname = $2
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _dexists ( NAME )
RETURNS BOOLEAN AS $$
   SELECT EXISTS(
       SELECT true
         FROM pg_catalog.pg_type t
        WHERE t.typname = $1
          AND pg_catalog.pg_type_is_visible(t.oid)
   );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_dtype( NAME, TEXT, BOOLEAN )
RETURNS TEXT AS $$
    SELECT CASE WHEN $3 AND pg_catalog.pg_type_is_visible(t.oid)
                THEN quote_ident(tn.nspname) || '.'
                ELSE ''
            END || pg_catalog.format_type(t.oid, t.typtypmod)
      FROM pg_catalog.pg_type d
      JOIN pg_catalog.pg_namespace dn ON d.typnamespace = dn.oid
      JOIN pg_catalog.pg_type t       ON d.typbasetype  = t.oid
      JOIN pg_catalog.pg_namespace tn ON t.typnamespace = tn.oid
     WHERE d.typisdefined
       AND dn.nspname = $1
       AND d.typname  = LOWER($2)
       AND d.typtype  = 'd'
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_dtype( NAME )
RETURNS TEXT AS $$
    SELECT pg_catalog.format_type(t.oid, t.typtypmod)
      FROM pg_catalog.pg_type d
      JOIN pg_catalog.pg_type t  ON d.typbasetype  = t.oid
     WHERE d.typisdefined
       AND pg_catalog.pg_type_is_visible(d.oid)
       AND d.typname = LOWER($1)
       AND d.typtype = 'd'
$$ LANGUAGE sql;

-- domain_type_is( schema, domain, schema, type, description )
CREATE OR REPLACE FUNCTION domain_type_is( NAME, TEXT, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1, $2, true);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $5 ) || E'\n' || diag (
            '   Domain ' || quote_ident($1) || '.' || $2
            || ' does not exist'
        );
    END IF;

    RETURN is( actual_type, quote_ident($3) || '.' || _quote_ident_like($4, actual_type), $5 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_is( schema, domain, schema, type )
CREATE OR REPLACE FUNCTION domain_type_is( NAME, TEXT, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_is(
        $1, $2, $3, $4,
        'Domain ' || quote_ident($1) || '.' || $2
        || ' should extend type ' || quote_ident($3) || '.' || $4
    );
$$ LANGUAGE SQL;

-- domain_type_is( schema, domain, type, description )
CREATE OR REPLACE FUNCTION domain_type_is( NAME, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1, $2, false);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $4 ) || E'\n' || diag (
            '   Domain ' || quote_ident($1) || '.' || $2
            || ' does not exist'
        );
    END IF;

    RETURN is( actual_type, _quote_ident_like($3, actual_type), $4 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_is( schema, domain, type )
CREATE OR REPLACE FUNCTION domain_type_is( NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_is(
        $1, $2, $3,
        'Domain ' || quote_ident($1) || '.' || $2
        || ' should extend type ' || $3
    );
$$ LANGUAGE SQL;

-- domain_type_is( domain, type, description )
CREATE OR REPLACE FUNCTION domain_type_is( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $3 ) || E'\n' || diag (
            '   Domain ' ||  $1 || ' does not exist'
        );
    END IF;

    RETURN is( actual_type, _quote_ident_like($2, actual_type), $3 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_is( domain, type )
CREATE OR REPLACE FUNCTION domain_type_is( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_is(
        $1, $2,
        'Domain ' || $1 || ' should extend type ' || $2
    );
$$ LANGUAGE SQL;

-- domain_type_isnt( schema, domain, schema, type, description )
CREATE OR REPLACE FUNCTION domain_type_isnt( NAME, TEXT, NAME, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1, $2, true);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $5 ) || E'\n' || diag (
            '   Domain ' || quote_ident($1) || '.' || $2
            || ' does not exist'
        );
    END IF;

    RETURN isnt( actual_type, quote_ident($3) || '.' || _quote_ident_like($4, actual_type), $5 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_isnt( schema, domain, schema, type )
CREATE OR REPLACE FUNCTION domain_type_isnt( NAME, TEXT, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_isnt(
        $1, $2, $3, $4,
        'Domain ' || quote_ident($1) || '.' || $2
        || ' should not extend type ' || quote_ident($3) || '.' || $4
    );
$$ LANGUAGE SQL;

-- domain_type_isnt( schema, domain, type, description )
CREATE OR REPLACE FUNCTION domain_type_isnt( NAME, TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1, $2, false);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $4 ) || E'\n' || diag (
            '   Domain ' || quote_ident($1) || '.' || $2
            || ' does not exist'
        );
    END IF;

    RETURN isnt( actual_type, _quote_ident_like($3, actual_type), $4 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_isnt( schema, domain, type )
CREATE OR REPLACE FUNCTION domain_type_isnt( NAME, TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_isnt(
        $1, $2, $3,
        'Domain ' || quote_ident($1) || '.' || $2
        || ' should not extend type ' || $3
    );
$$ LANGUAGE SQL;

-- domain_type_isnt( domain, type, description )
CREATE OR REPLACE FUNCTION domain_type_isnt( TEXT, TEXT, TEXT )
RETURNS TEXT AS $$
DECLARE
    actual_type TEXT := _get_dtype($1);
BEGIN
    IF actual_type IS NULL THEN
        RETURN fail( $3 ) || E'\n' || diag (
            '   Domain ' ||  $1 || ' does not exist'
        );
    END IF;

    RETURN isnt( actual_type, _quote_ident_like($2, actual_type), $3 );
END;
$$ LANGUAGE plpgsql;

-- domain_type_isnt( domain, type )
CREATE OR REPLACE FUNCTION domain_type_isnt( TEXT, TEXT )
RETURNS TEXT AS $$
    SELECT domain_type_isnt(
        $1, $2,
        'Domain ' || $1 || ' should not extend type ' || $2
    );
$$ LANGUAGE SQL;

-- row_eq( sql, record, description )
CREATE OR REPLACE FUNCTION row_eq( TEXT, anyelement, TEXT )
RETURNS TEXT AS $$
DECLARE
    rec    RECORD;
BEGIN
    EXECUTE _query($1) INTO rec;
    IF NOT rec IS DISTINCT FROM $2 THEN RETURN ok(true, $3); END IF;
    RETURN ok(false, $3 ) || E'\n' || diag(
           '        have: ' || CASE WHEN rec IS NULL THEN 'NULL' ELSE rec::text END ||
        E'\n        want: ' || CASE WHEN $2  IS NULL THEN 'NULL' ELSE $2::text  END
    );
END;
$$ LANGUAGE plpgsql;

-- row_eq( sql, record )
CREATE OR REPLACE FUNCTION row_eq( TEXT, anyelement )
RETURNS TEXT AS $$
    SELECT row_eq($1, $2, NULL );
$$ LANGUAGE sql;

-- triggers_are( schema, table, triggers[], description )
CREATE OR REPLACE FUNCTION triggers_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'triggers',
        ARRAY(
            SELECT t.tgname
              FROM pg_catalog.pg_trigger t
              JOIN pg_catalog.pg_class c     ON c.oid = t.tgrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE n.nspname = $1
               AND c.relname = $2
               AND NOT t.tgisinternal
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT t.tgname
              FROM pg_catalog.pg_trigger t
              JOIN pg_catalog.pg_class c     ON c.oid = t.tgrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE n.nspname = $1
               AND c.relname = $2
               AND NOT t.tgisinternal
        ),
        $4
    );
$$ LANGUAGE SQL;

-- triggers_are( schema, table, triggers[] )
CREATE OR REPLACE FUNCTION triggers_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT triggers_are( $1, $2, $3, 'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct triggers' );
$$ LANGUAGE SQL;

-- triggers_are( table, triggers[], description )
CREATE OR REPLACE FUNCTION triggers_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'triggers',
        ARRAY(
            SELECT t.tgname
              FROM pg_catalog.pg_trigger t
              JOIN pg_catalog.pg_class c ON c.oid = t.tgrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE c.relname = $1
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND NOT t.tgisinternal
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT t.tgname
              FROM pg_catalog.pg_trigger t
              JOIN pg_catalog.pg_class c ON c.oid = t.tgrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND NOT t.tgisinternal
        ),
        $3
    );
$$ LANGUAGE SQL;

-- triggers_are( table, triggers[] )
CREATE OR REPLACE FUNCTION triggers_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT triggers_are( $1, $2, 'Table ' || quote_ident($1) || ' should have the correct triggers' );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _areni ( text, text[], text[], TEXT )
RETURNS TEXT AS $$
DECLARE
    what    ALIAS FOR $1;
    extras  ALIAS FOR $2;
    missing ALIAS FOR $3;
    descr   ALIAS FOR $4;
    msg     TEXT    := '';
    res     BOOLEAN := TRUE;
BEGIN
    IF extras[1] IS NOT NULL THEN
        res = FALSE;
        msg := E'\n' || diag(
            '    Extra ' || what || E':\n        '
            ||  _array_to_sorted_string( extras, E'\n        ' )
        );
    END IF;
    IF missing[1] IS NOT NULL THEN
        res = FALSE;
        msg := msg || E'\n' || diag(
            '    Missing ' || what || E':\n        '
            ||  _array_to_sorted_string( missing, E'\n        ' )
        );
    END IF;

    RETURN ok(res, descr) || msg;
END;
$$ LANGUAGE plpgsql;


-- casts_are( casts[], description )
CREATE OR REPLACE FUNCTION casts_are ( TEXT[], TEXT )
RETURNS TEXT AS $$
    SELECT _areni(
        'casts',
        ARRAY(
            SELECT pg_catalog.format_type(castsource, NULL)
                   || ' AS ' || pg_catalog.format_type(casttarget, NULL)
              FROM pg_catalog.pg_cast c
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT pg_catalog.format_type(castsource, NULL)
                   || ' AS ' || pg_catalog.format_type(casttarget, NULL)
              FROM pg_catalog.pg_cast c
        ),
        $2
    );
$$ LANGUAGE sql;

-- casts_are( casts[] )
CREATE OR REPLACE FUNCTION casts_are ( TEXT[] )
RETURNS TEXT AS $$
    SELECT casts_are( $1, 'There should be the correct casts');
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION display_oper ( NAME, OID )
RETURNS TEXT AS $$
    SELECT $1 || substring($2::regoperator::text, '[(][^)]+[)]$')
$$ LANGUAGE SQL;

-- operators_are( schema, operators[], description )
CREATE OR REPLACE FUNCTION operators_are( NAME, TEXT[], TEXT )
RETURNS TEXT AS $$
    SELECT _areni(
        'operators',
        ARRAY(
            SELECT display_oper(o.oprname, o.oid) || ' RETURNS ' || o.oprresult::regtype
              FROM pg_catalog.pg_operator o
              JOIN pg_catalog.pg_namespace n ON o.oprnamespace = n.oid
             WHERE n.nspname = $1
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT display_oper(o.oprname, o.oid) || ' RETURNS ' || o.oprresult::regtype
              FROM pg_catalog.pg_operator o
              JOIN pg_catalog.pg_namespace n ON o.oprnamespace = n.oid
             WHERE n.nspname = $1
        ),
        $3
    );
$$ LANGUAGE SQL;

-- operators_are( schema, operators[] )
CREATE OR REPLACE FUNCTION operators_are ( NAME, TEXT[] )
RETURNS TEXT AS $$
    SELECT operators_are($1, $2, 'Schema ' || quote_ident($1) || ' should have the correct operators' );
$$ LANGUAGE SQL;

-- operators_are( operators[], description )
CREATE OR REPLACE FUNCTION operators_are( TEXT[], TEXT )
RETURNS TEXT AS $$
    SELECT _areni(
        'operators',
        ARRAY(
            SELECT display_oper(o.oprname, o.oid) || ' RETURNS ' || o.oprresult::regtype
              FROM pg_catalog.pg_operator o
              JOIN pg_catalog.pg_namespace n ON o.oprnamespace = n.oid
             WHERE pg_catalog.pg_operator_is_visible(o.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
            EXCEPT
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
        ),
        ARRAY(
            SELECT $1[i]
              FROM generate_series(1, array_upper($1, 1)) s(i)
            EXCEPT
            SELECT display_oper(o.oprname, o.oid) || ' RETURNS ' || o.oprresult::regtype
              FROM pg_catalog.pg_operator o
              JOIN pg_catalog.pg_namespace n ON o.oprnamespace = n.oid
             WHERE pg_catalog.pg_operator_is_visible(o.oid)
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
        ),
        $2
    );
$$ LANGUAGE SQL;

-- operators_are( operators[] )
CREATE OR REPLACE FUNCTION operators_are ( TEXT[] )
RETURNS TEXT AS $$
    SELECT operators_are($1, 'There should be the correct operators')
$$ LANGUAGE SQL;

-- columns_are( schema, table, columns[], description )
CREATE OR REPLACE FUNCTION columns_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'columns',
        ARRAY(
            SELECT a.attname
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE n.nspname = $1
               AND c.relname = $2
               AND a.attnum > 0
               AND NOT a.attisdropped
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT a.attname
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE n.nspname = $1
               AND c.relname = $2
               AND a.attnum > 0
               AND NOT a.attisdropped
        ),
        $4
    );
$$ LANGUAGE SQL;

-- columns_are( schema, table, columns[] )
CREATE OR REPLACE FUNCTION columns_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT columns_are( $1, $2, $3, 'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct columns' );
$$ LANGUAGE SQL;

-- columns_are( table, columns[], description )
CREATE OR REPLACE FUNCTION columns_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'columns',
        ARRAY(
            SELECT a.attname
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_table_is_visible(c.oid)
               AND c.relname = $1
               AND a.attnum > 0
               AND NOT a.attisdropped
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT a.attname
              FROM pg_catalog.pg_namespace n
              JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
              JOIN pg_catalog.pg_attribute a ON c.oid = a.attrelid
             WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
               AND pg_catalog.pg_table_is_visible(c.oid)
               AND c.relname = $1
               AND a.attnum > 0
               AND NOT a.attisdropped
        ),
        $3
    );
$$ LANGUAGE SQL;

-- columns_are( table, columns[] )
CREATE OR REPLACE FUNCTION columns_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT columns_are( $1, $2, 'Table ' || quote_ident($1) || ' should have the correct columns' );
$$ LANGUAGE SQL;

-- _get_db_owner( dbname )
CREATE OR REPLACE FUNCTION _get_db_owner( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(datdba)
      FROM pg_catalog.pg_database
     WHERE datname = $1;
$$ LANGUAGE SQL;

-- db_owner_is ( dbname, user, description )
CREATE OR REPLACE FUNCTION db_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    dbowner NAME := _get_db_owner($1);
BEGIN
    -- Make sure the database exists.
    IF dbowner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Database ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(dbowner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- db_owner_is ( dbname, user )
CREATE OR REPLACE FUNCTION db_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT db_owner_is(
        $1, $2,
        'Database ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- _get_schema_owner( schema )
CREATE OR REPLACE FUNCTION _get_schema_owner( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(nspowner)
      FROM pg_catalog.pg_namespace
     WHERE nspname = $1;
$$ LANGUAGE SQL;

-- schema_owner_is ( schema, user, description )
CREATE OR REPLACE FUNCTION schema_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_schema_owner($1);
BEGIN
    -- Make sure the schema exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Schema ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- schema_owner_is ( schema, user )
CREATE OR REPLACE FUNCTION schema_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT schema_owner_is(
        $1, $2,
        'Schema ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_rel_owner ( NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(c.relowner)
      FROM pg_catalog.pg_class c
      JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE n.nspname = $1
       AND c.relname = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_rel_owner ( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(c.relowner)
      FROM pg_catalog.pg_class c
     WHERE c.relname = $1
       AND pg_catalog.pg_table_is_visible(c.oid)
$$ LANGUAGE SQL;

-- relation_owner_is ( schema, relation, user, description )
CREATE OR REPLACE FUNCTION relation_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner($1, $2);
BEGIN
    -- Make sure the relation exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Relation ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- relation_owner_is ( schema, relation, user )
CREATE OR REPLACE FUNCTION relation_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT relation_owner_is(
        $1, $2, $3,
        'Relation ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- relation_owner_is ( relation, user, description )
CREATE OR REPLACE FUNCTION relation_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner($1);
BEGIN
    -- Make sure the relation exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Relation ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- relation_owner_is ( relation, user )
CREATE OR REPLACE FUNCTION relation_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT relation_owner_is(
        $1, $2,
        'Relation ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_rel_owner ( CHAR[], NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(c.relowner)
      FROM pg_catalog.pg_class c
      JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind = ANY($1)
       AND n.nspname = $2
       AND c.relname = $3
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_rel_owner ( CHAR[], NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(c.relowner)
      FROM pg_catalog.pg_class c
     WHERE c.relkind = ANY($1)
       AND c.relname = $2
       AND pg_catalog.pg_table_is_visible(c.oid)
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_rel_owner ( CHAR, NAME, NAME )
RETURNS NAME AS $$
    SELECT _get_rel_owner(ARRAY[$1], $2, $3);
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_rel_owner ( CHAR, NAME )
RETURNS NAME AS $$
    SELECT _get_rel_owner(ARRAY[$1], $2);
$$ LANGUAGE SQL;

-- table_owner_is ( schema, table, user, description )
CREATE OR REPLACE FUNCTION table_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('{r,p}'::char[], $1, $2);
BEGIN
    -- Make sure the table exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- table_owner_is ( schema, table, user )
CREATE OR REPLACE FUNCTION table_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT table_owner_is(
        $1, $2, $3,
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- table_owner_is ( table, user, description )
CREATE OR REPLACE FUNCTION table_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('{r,p}'::char[], $1);
BEGIN
    -- Make sure the table exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Table ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- table_owner_is ( table, user )
CREATE OR REPLACE FUNCTION table_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT table_owner_is(
        $1, $2,
        'Table ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- view_owner_is ( schema, view, user, description )
CREATE OR REPLACE FUNCTION view_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('v'::char, $1, $2);
BEGIN
    -- Make sure the view exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    View ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- view_owner_is ( schema, view, user )
CREATE OR REPLACE FUNCTION view_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT view_owner_is(
        $1, $2, $3,
        'View ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- view_owner_is ( view, user, description )
CREATE OR REPLACE FUNCTION view_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('v'::char, $1);
BEGIN
    -- Make sure the view exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    View ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- view_owner_is ( view, user )
CREATE OR REPLACE FUNCTION view_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT view_owner_is(
        $1, $2,
        'View ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- sequence_owner_is ( schema, sequence, user, description )
CREATE OR REPLACE FUNCTION sequence_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('S'::char, $1, $2);
BEGIN
    -- Make sure the sequence exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Sequence ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- sequence_owner_is ( schema, sequence, user )
CREATE OR REPLACE FUNCTION sequence_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT sequence_owner_is(
        $1, $2, $3,
        'Sequence ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- sequence_owner_is ( sequence, user, description )
CREATE OR REPLACE FUNCTION sequence_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('S'::char, $1);
BEGIN
    -- Make sure the sequence exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Sequence ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- sequence_owner_is ( sequence, user )
CREATE OR REPLACE FUNCTION sequence_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT sequence_owner_is(
        $1, $2,
        'Sequence ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- composite_owner_is ( schema, composite, user, description )
CREATE OR REPLACE FUNCTION composite_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('c'::char, $1, $2);
BEGIN
    -- Make sure the composite exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Composite type ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- composite_owner_is ( schema, composite, user )
CREATE OR REPLACE FUNCTION composite_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT composite_owner_is(
        $1, $2, $3,
        'Composite type ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- composite_owner_is ( composite, user, description )
CREATE OR REPLACE FUNCTION composite_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('c'::char, $1);
BEGIN
    -- Make sure the composite exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Composite type ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- composite_owner_is ( composite, user )
CREATE OR REPLACE FUNCTION composite_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT composite_owner_is(
        $1, $2,
        'Composite type ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- foreign_table_owner_is ( schema, table, user, description )
CREATE OR REPLACE FUNCTION foreign_table_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('f'::char, $1, $2);
BEGIN
    -- Make sure the table exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Foreign table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- foreign_table_owner_is ( schema, table, user )
CREATE OR REPLACE FUNCTION foreign_table_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT foreign_table_owner_is(
        $1, $2, $3,
        'Foreign table ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- foreign_table_owner_is ( table, user, description )
CREATE OR REPLACE FUNCTION foreign_table_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('f'::char, $1);
BEGIN
    -- Make sure the table exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Foreign table ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- foreign_table_owner_is ( table, user )
CREATE OR REPLACE FUNCTION foreign_table_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT foreign_table_owner_is(
        $1, $2,
        'Foreign table ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_func_owner ( NAME, NAME, NAME[] )
RETURNS NAME AS $$
    SELECT owner
      FROM tap_funky
     WHERE schema = $1
       AND name   = $2
       AND args   = array_to_string($3, ',')
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_func_owner ( NAME, NAME[] )
RETURNS NAME AS $$
    SELECT owner
      FROM tap_funky
     WHERE name = $1
       AND args = array_to_string($2, ',')
       AND is_visible
$$ LANGUAGE SQL;

-- function_owner_is( schema, function, args[], user, description )
CREATE OR REPLACE FUNCTION function_owner_is ( NAME, NAME, NAME[], NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_func_owner($1, $2, $3);
BEGIN
    -- Make sure the function exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            E'    Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
                    array_to_string($3, ', ') || ') does not exist'
        );
    END IF;

    RETURN is(owner, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- function_owner_is( schema, function, args[], user )
CREATE OR REPLACE FUNCTION function_owner_is( NAME, NAME, NAME[], NAME )
RETURNS TEXT AS $$
    SELECT function_owner_is(
        $1, $2, $3, $4,
        'Function ' || quote_ident($1) || '.' || quote_ident($2) || '(' ||
        array_to_string($3, ', ') || ') should be owned by ' || quote_ident($4)
    );
$$ LANGUAGE sql;

-- function_owner_is( function, args[], user, description )
CREATE OR REPLACE FUNCTION function_owner_is ( NAME, NAME[], NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_func_owner($1, $2);
BEGIN
    -- Make sure the function exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Function ' || quote_ident($1) || '(' ||
                    array_to_string($2, ', ') || ') does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- function_owner_is( function, args[], user )
CREATE OR REPLACE FUNCTION function_owner_is( NAME, NAME[], NAME )
RETURNS TEXT AS $$
    SELECT function_owner_is(
        $1, $2, $3,
        'Function ' || quote_ident($1) || '(' ||
        array_to_string($2, ', ') || ') should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- _get_tablespace_owner( tablespace )
CREATE OR REPLACE FUNCTION _get_tablespace_owner( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(spcowner)
      FROM pg_catalog.pg_tablespace
     WHERE spcname = $1;
$$ LANGUAGE SQL;

-- tablespace_owner_is ( tablespace, user, description )
CREATE OR REPLACE FUNCTION tablespace_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_tablespace_owner($1);
BEGIN
    -- Make sure the tablespace exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Tablespace ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- tablespace_owner_is ( tablespace, user )
CREATE OR REPLACE FUNCTION tablespace_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT tablespace_owner_is(
        $1, $2,
        'Tablespace ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_index_owner( NAME, NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(ci.relowner)
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
      JOIN pg_catalog.pg_namespace n ON n.oid = ct.relnamespace
     WHERE n.nspname  = $1
       AND ct.relname = $2
       AND ci.relname = $3;
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_index_owner( NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(ci.relowner)
      FROM pg_catalog.pg_index x
      JOIN pg_catalog.pg_class ct    ON ct.oid = x.indrelid
      JOIN pg_catalog.pg_class ci    ON ci.oid = x.indexrelid
     WHERE ct.relname = $1
       AND ci.relname = $2
       AND pg_catalog.pg_table_is_visible(ct.oid);
$$ LANGUAGE sql;

-- index_owner_is ( schema, table, index, user, description )
CREATE OR REPLACE FUNCTION index_owner_is ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_index_owner($1, $2, $3);
BEGIN
    -- Make sure the index exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            E'    Index ' || quote_ident($3) || ' ON '
            || quote_ident($1) || '.' || quote_ident($2) || ' not found'
        );
    END IF;

    RETURN is(owner, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- index_owner_is ( schema, table, index, user )
CREATE OR REPLACE FUNCTION index_owner_is ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT index_owner_is(
        $1, $2, $3, $4,
        'Index ' || quote_ident($3) || ' ON '
        || quote_ident($1) || '.' || quote_ident($2)
        || ' should be owned by ' || quote_ident($4)
    );
$$ LANGUAGE sql;

-- index_owner_is ( table, index, user, description )
CREATE OR REPLACE FUNCTION index_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_index_owner($1, $2);
BEGIN
    -- Make sure the index exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Index ' || quote_ident($2) || ' ON ' || quote_ident($1) || ' not found'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- index_owner_is ( table, index, user )
CREATE OR REPLACE FUNCTION index_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT index_owner_is(
        $1, $2, $3,
        'Index ' || quote_ident($2) || ' ON '
        || quote_ident($1) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- _get_language_owner( language )
CREATE OR REPLACE FUNCTION _get_language_owner( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(lanowner)
      FROM pg_catalog.pg_language
     WHERE lanname = $1;
$$ LANGUAGE SQL;

-- language_owner_is ( language, user, description )
CREATE OR REPLACE FUNCTION language_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_language_owner($1);
BEGIN
    -- Make sure the language exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Language ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- language_owner_is ( language, user )
CREATE OR REPLACE FUNCTION language_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT language_owner_is(
        $1, $2,
        'Language ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_opclass_owner ( NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(opcowner)
      FROM pg_catalog.pg_opclass oc
      JOIN pg_catalog.pg_namespace n ON oc.opcnamespace = n.oid
     WHERE n.nspname = $1
       AND opcname   = $2;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_opclass_owner ( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(opcowner)
      FROM pg_catalog.pg_opclass
     WHERE opcname = $1
       AND pg_catalog.pg_opclass_is_visible(oid);
$$ LANGUAGE SQL;

-- opclass_owner_is( schema, opclass, user, description )
CREATE OR REPLACE FUNCTION opclass_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_opclass_owner($1, $2);
BEGIN
    -- Make sure the opclass exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Operator class ' || quote_ident($1) || '.' || quote_ident($2)
            || ' not found'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- opclass_owner_is( schema, opclass, user )
CREATE OR REPLACE FUNCTION opclass_owner_is( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT opclass_owner_is(
        $1, $2, $3,
        'Operator class ' || quote_ident($1) || '.' || quote_ident($2) ||
        ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- opclass_owner_is( opclass, user, description )
CREATE OR REPLACE FUNCTION opclass_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_opclass_owner($1);
BEGIN
    -- Make sure the opclass exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Operator class ' || quote_ident($1) || ' not found'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- opclass_owner_is( opclass, user )
CREATE OR REPLACE FUNCTION opclass_owner_is( NAME, NAME )
RETURNS TEXT AS $$
    SELECT opclass_owner_is(
        $1, $2,
        'Operator class ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _get_type_owner ( NAME, NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(t.typowner)
      FROM pg_catalog.pg_type t
      JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
     WHERE n.nspname = $1
       AND t.typname = $2
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_type_owner ( NAME )
RETURNS NAME AS $$
    SELECT pg_catalog.pg_get_userbyid(typowner)
      FROM pg_catalog.pg_type
     WHERE typname = $1
       AND pg_catalog.pg_type_is_visible(oid)
$$ LANGUAGE SQL;

-- type_owner_is ( schema, type, user, description )
CREATE OR REPLACE FUNCTION type_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_type_owner($1, $2);
BEGIN
    -- Make sure the type exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Type ' || quote_ident($1) || '.' || quote_ident($2) || ' not found'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- type_owner_is ( schema, type, user )
CREATE OR REPLACE FUNCTION type_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT type_owner_is(
        $1, $2, $3,
        'Type ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- type_owner_is ( type, user, description )
CREATE OR REPLACE FUNCTION type_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_type_owner($1);
BEGIN
    -- Make sure the type exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Type ' || quote_ident($1) || ' not found'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- type_owner_is ( type, user )
CREATE OR REPLACE FUNCTION type_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT type_owner_is(
        $1, $2,
        'Type ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION _assets_are ( text, text[], text[], TEXT )
RETURNS TEXT AS $$
    SELECT _areni(
        $1,
        ARRAY(
            SELECT UPPER($2[i]) AS thing
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
             ORDER BY thing
        ),
        ARRAY(
            SELECT $3[i] AS thing
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT UPPER($2[i])
              FROM generate_series(1, array_upper($2, 1)) s(i)
             ORDER BY thing
        ),
        $4
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_table_privs(NAME, TEXT)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := _table_privs();
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        BEGIN
            IF pg_catalog.has_table_privilege($1, $2, privs[i]) THEN
                grants := grants || privs[i];
            END IF;
        EXCEPTION WHEN undefined_table THEN
            -- Not a valid table name.
            RETURN '{undefined_table}';
        WHEN undefined_object THEN
            -- Not a valid role.
            RETURN '{undefined_role}';
        WHEN invalid_parameter_value THEN
            -- Not a valid permission on this version of PostgreSQL; ignore;
        END;
    END LOOP;
    RETURN grants;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _table_privs()
RETURNS NAME[] AS $$
DECLARE
    pgversion INTEGER := pg_version_num();
BEGIN
    IF pgversion < 80200 THEN RETURN ARRAY[
        'DELETE', 'INSERT', 'REFERENCES', 'RULE', 'SELECT', 'TRIGGER', 'UPDATE'
    ];
    ELSIF pgversion < 80400 THEN RETURN ARRAY[
        'DELETE', 'INSERT', 'REFERENCES', 'SELECT', 'TRIGGER', 'UPDATE'
    ];
    ELSE RETURN ARRAY[
        'DELETE', 'INSERT', 'REFERENCES', 'SELECT', 'TRIGGER', 'TRUNCATE', 'UPDATE'
    ];
    END IF;
END;
$$ language plpgsql;

-- table_privs_are ( schema, table, user, privileges[], description )
CREATE OR REPLACE FUNCTION table_privs_are ( NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_table_privs( $3, quote_ident($1) || '.' || quote_ident($2) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Role ' || quote_ident($3) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- table_privs_are ( schema, table, user, privileges[] )
CREATE OR REPLACE FUNCTION table_privs_are ( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT table_privs_are(
        $1, $2, $3, $4,
        'Role ' || quote_ident($3) || ' should be granted '
            || CASE WHEN $4[1] IS NULL THEN 'no privileges' ELSE array_to_string($4, ', ') END
            || ' on table ' || quote_ident($1) || '.' || quote_ident($2)
    );
$$ LANGUAGE SQL;

-- table_privs_are ( table, user, privileges[], description )
CREATE OR REPLACE FUNCTION table_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_table_privs( $2, quote_ident($1) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- table_privs_are ( table, user, privileges[] )
CREATE OR REPLACE FUNCTION table_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT table_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on table ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _db_privs()
RETURNS NAME[] AS $$
DECLARE
    pgversion INTEGER := pg_version_num();
BEGIN
    IF pgversion < 80200 THEN
        RETURN ARRAY['CREATE', 'TEMPORARY'];
    ELSE
        RETURN ARRAY['CREATE', 'CONNECT', 'TEMPORARY'];
    END IF;
END;
$$ language plpgsql;

CREATE OR REPLACE FUNCTION _get_db_privs(NAME, TEXT)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := _db_privs();
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        BEGIN
            IF pg_catalog.has_database_privilege($1, $2, privs[i]) THEN
                grants := grants || privs[i];
            END IF;
        EXCEPTION WHEN invalid_catalog_name THEN
            -- Not a valid db name.
            RETURN '{invalid_catalog_name}';
        WHEN undefined_object THEN
            -- Not a valid role.
            RETURN '{undefined_role}';
        WHEN invalid_parameter_value THEN
            -- Not a valid permission on this version of PostgreSQL; ignore;
        END;
    END LOOP;
    RETURN grants;
END;
$$ LANGUAGE plpgsql;

-- database_privs_are ( db, user, privileges[], description )
CREATE OR REPLACE FUNCTION database_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_db_privs( $2, $1::TEXT );
BEGIN
    IF grants[1] = 'invalid_catalog_name' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Database ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- database_privs_are ( db, user, privileges[] )
CREATE OR REPLACE FUNCTION database_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT database_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on database ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_func_privs(TEXT, TEXT)
RETURNS TEXT[] AS $$
BEGIN
    IF pg_catalog.has_function_privilege($1, $2, 'EXECUTE') THEN
        RETURN '{EXECUTE}';
    ELSE
        RETURN '{}';
    END IF;
EXCEPTION
    -- Not a valid func name.
    WHEN undefined_function THEN RETURN '{undefined_function}';
    -- Not a valid role.
    WHEN undefined_object   THEN RETURN '{undefined_role}';
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION _fprivs_are ( TEXT, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_func_privs($2, $1);
BEGIN
    IF grants[1] = 'undefined_function' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Function ' || $1 || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- function_privs_are ( schema, function, args[], user, privileges[], description )
CREATE OR REPLACE FUNCTION function_privs_are ( NAME, NAME, NAME[], NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _fprivs_are(
        quote_ident($1) || '.' || quote_ident($2) || '(' || array_to_string($3, ', ') || ')',
        $4, $5, $6
    );
$$ LANGUAGE SQL;

-- function_privs_are ( schema, function, args[], user, privileges[] )
CREATE OR REPLACE FUNCTION function_privs_are ( NAME, NAME, NAME[], NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT function_privs_are(
        $1, $2, $3, $4, $5,
        'Role ' || quote_ident($4) || ' should be granted '
            || CASE WHEN $5[1] IS NULL THEN 'no privileges' ELSE array_to_string($5, ', ') END
            || ' on function ' || quote_ident($1) || '.' || quote_ident($2)
            || '(' || array_to_string($3, ', ') || ')'
    );
$$ LANGUAGE SQL;

-- function_privs_are ( function, args[], user, privileges[], description )
CREATE OR REPLACE FUNCTION function_privs_are ( NAME, NAME[], NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _fprivs_are(
        quote_ident($1) || '(' || array_to_string($2, ', ') || ')',
        $3, $4, $5
    );
$$ LANGUAGE SQL;

-- function_privs_are ( function, args[], user, privileges[] )
CREATE OR REPLACE FUNCTION function_privs_are ( NAME, NAME[], NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT function_privs_are(
        $1, $2, $3, $4,
        'Role ' || quote_ident($3) || ' should be granted '
            || CASE WHEN $4[1] IS NULL THEN 'no privileges' ELSE array_to_string($4, ', ') END
            || ' on function ' || quote_ident($1) || '(' || array_to_string($2, ', ') || ')'
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_lang_privs (NAME, TEXT)
RETURNS TEXT[] AS $$
BEGIN
    IF pg_catalog.has_language_privilege($1, $2, 'USAGE') THEN
        RETURN '{USAGE}';
    ELSE
        RETURN '{}';
    END IF;
EXCEPTION WHEN undefined_object THEN
    -- Same error code for unknown user or language. So figure out which.
    RETURN CASE WHEN SQLERRM LIKE '%' || $1 || '%' THEN
        '{undefined_role}'
    ELSE
        '{undefined_language}'
    END;
END;
$$ LANGUAGE plpgsql;

-- language_privs_are ( lang, user, privileges[], description )
CREATE OR REPLACE FUNCTION language_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_lang_privs( $2, quote_ident($1) );
BEGIN
    IF grants[1] = 'undefined_language' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Language ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- language_privs_are ( lang, user, privileges[] )
CREATE OR REPLACE FUNCTION language_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT language_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on language ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_schema_privs(NAME, TEXT)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := ARRAY['CREATE', 'USAGE'];
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        IF pg_catalog.has_schema_privilege($1, $2, privs[i]) THEN
            grants := grants || privs[i];
        END IF;
    END LOOP;
    RETURN grants;
EXCEPTION
    -- Not a valid schema name.
    WHEN invalid_schema_name THEN RETURN '{invalid_schema_name}';
    -- Not a valid role.
    WHEN undefined_object   THEN RETURN '{undefined_role}';
END;
$$ LANGUAGE plpgsql;

-- schema_privs_are ( schema, user, privileges[], description )
CREATE OR REPLACE FUNCTION schema_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_schema_privs( $2, $1::TEXT );
BEGIN
    IF grants[1] = 'invalid_schema_name' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Schema ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- schema_privs_are ( schema, user, privileges[] )
CREATE OR REPLACE FUNCTION schema_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT schema_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on schema ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_tablespaceprivs (NAME, TEXT)
RETURNS TEXT[] AS $$
BEGIN
    IF pg_catalog.has_tablespace_privilege($1, $2, 'CREATE') THEN
        RETURN '{CREATE}';
    ELSE
        RETURN '{}';
    END IF;
EXCEPTION WHEN undefined_object THEN
    -- Same error code for unknown user or tablespace. So figure out which.
    RETURN CASE WHEN SQLERRM LIKE '%' || $1 || '%' THEN
        '{undefined_role}'
    ELSE
        '{undefined_tablespace}'
    END;
END;
$$ LANGUAGE plpgsql;

-- tablespace_privs_are ( tablespace, user, privileges[], description )
CREATE OR REPLACE FUNCTION tablespace_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_tablespaceprivs( $2, $1::TEXT );
BEGIN
    IF grants[1] = 'undefined_tablespace' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Tablespace ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- tablespace_privs_are ( tablespace, user, privileges[] )
CREATE OR REPLACE FUNCTION tablespace_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT tablespace_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on tablespace ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_sequence_privs(NAME, TEXT)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := ARRAY['SELECT', 'UPDATE', 'USAGE'];
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        BEGIN
            IF pg_catalog.has_sequence_privilege($1, $2, privs[i]) THEN
                grants := grants || privs[i];
            END IF;
        EXCEPTION WHEN undefined_table THEN
            -- Not a valid sequence name.
            RETURN '{undefined_table}';
        WHEN undefined_object THEN
            -- Not a valid role.
            RETURN '{undefined_role}';
        WHEN invalid_parameter_value THEN
            -- Not a valid permission on this version of PostgreSQL; ignore;
        END;
    END LOOP;
    RETURN grants;
END;
$$ LANGUAGE plpgsql;

-- sequence_privs_are ( schema, sequence, user, privileges[], description )
CREATE OR REPLACE FUNCTION sequence_privs_are ( NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_sequence_privs( $3, quote_ident($1) || '.' || quote_ident($2) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Sequence ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Role ' || quote_ident($3) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- sequence_privs_are ( schema, sequence, user, privileges[] )
CREATE OR REPLACE FUNCTION sequence_privs_are ( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT sequence_privs_are(
        $1, $2, $3, $4,
        'Role ' || quote_ident($3) || ' should be granted '
            || CASE WHEN $4[1] IS NULL THEN 'no privileges' ELSE array_to_string($4, ', ') END
            || ' on sequence '|| quote_ident($1) || '.' || quote_ident($2)
    );
$$ LANGUAGE SQL;

-- sequence_privs_are ( sequence, user, privileges[], description )
CREATE OR REPLACE FUNCTION sequence_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_sequence_privs( $2, quote_ident($1) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Sequence ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- sequence_privs_are ( sequence, user, privileges[] )
CREATE OR REPLACE FUNCTION sequence_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT sequence_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on sequence ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_ac_privs(NAME, TEXT)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := ARRAY['INSERT', 'REFERENCES', 'SELECT', 'UPDATE'];
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        BEGIN
            IF pg_catalog.has_any_column_privilege($1, $2, privs[i]) THEN
                grants := grants || privs[i];
            END IF;
        EXCEPTION WHEN undefined_table THEN
            -- Not a valid table name.
            RETURN '{undefined_table}';
        WHEN undefined_object THEN
            -- Not a valid role.
            RETURN '{undefined_role}';
        WHEN invalid_parameter_value THEN
            -- Not a valid permission on this version of PostgreSQL; ignore;
        END;
    END LOOP;
    RETURN grants;
END;
$$ LANGUAGE plpgsql;

-- any_column_privs_are ( schema, table, user, privileges[], description )
CREATE OR REPLACE FUNCTION any_column_privs_are ( NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_ac_privs( $3, quote_ident($1) || '.' || quote_ident($2) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Role ' || quote_ident($3) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- any_column_privs_are ( schema, table, user, privileges[] )
CREATE OR REPLACE FUNCTION any_column_privs_are ( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT any_column_privs_are(
        $1, $2, $3, $4,
        'Role ' || quote_ident($3) || ' should be granted '
            || CASE WHEN $4[1] IS NULL THEN 'no privileges' ELSE array_to_string($4, ', ') END
            || ' on any column in '|| quote_ident($1) || '.' || quote_ident($2)
    );
$$ LANGUAGE SQL;

-- any_column_privs_are ( table, user, privileges[], description )
CREATE OR REPLACE FUNCTION any_column_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_ac_privs( $2, quote_ident($1) );
BEGIN
    IF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- any_column_privs_are ( table, user, privileges[] )
CREATE OR REPLACE FUNCTION any_column_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT any_column_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on any column in ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

-- _get_col_privs(user, table, column)
CREATE OR REPLACE FUNCTION _get_col_privs(NAME, TEXT, NAME)
RETURNS TEXT[] AS $$
DECLARE
    privs  TEXT[] := ARRAY['INSERT', 'REFERENCES', 'SELECT', 'UPDATE'];
    grants TEXT[] := '{}';
BEGIN
    FOR i IN 1..array_upper(privs, 1) LOOP
        IF pg_catalog.has_column_privilege($1, $2, $3, privs[i]) THEN
            grants := grants || privs[i];
        END IF;
    END LOOP;
    RETURN grants;
EXCEPTION
    -- Not a valid column name.
    WHEN undefined_column THEN RETURN '{undefined_column}';
    -- Not a valid table name.
    WHEN undefined_table THEN RETURN '{undefined_table}';
    -- Not a valid role.
    WHEN undefined_object THEN RETURN '{undefined_role}';
END;
$$ LANGUAGE plpgsql;

-- column_privs_are ( schema, table, column, user, privileges[], description )
CREATE OR REPLACE FUNCTION column_privs_are ( NAME, NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_col_privs( $4, quote_ident($1) || '.' || quote_ident($2), $3 );
BEGIN
    IF grants[1] = 'undefined_column' THEN
        RETURN ok(FALSE, $6) || E'\n' || diag(
            '    Column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3)
            || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $6) || E'\n' || diag(
            '    Table ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $6) || E'\n' || diag(
            '    Role ' || quote_ident($4) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $5, $6);
END;
$$ LANGUAGE plpgsql;

-- column_privs_are ( schema, table, column, user, privileges[] )
CREATE OR REPLACE FUNCTION column_privs_are ( NAME, NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT column_privs_are(
        $1, $2, $3, $4, $5,
        'Role ' || quote_ident($4) || ' should be granted '
            || CASE WHEN $5[1] IS NULL THEN 'no privileges' ELSE array_to_string($5, ', ') END
            || ' on column ' || quote_ident($1) || '.' || quote_ident($2) || '.' || quote_ident($3)
    );
$$ LANGUAGE SQL;

-- column_privs_are ( table, column, user, privileges[], description )
CREATE OR REPLACE FUNCTION column_privs_are ( NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_col_privs( $3, quote_ident($1), $2 );
BEGIN
    IF grants[1] = 'undefined_column' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Column ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_table' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Table ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $5) || E'\n' || diag(
            '    Role ' || quote_ident($3) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $4, $5);
END;
$$ LANGUAGE plpgsql;

-- column_privs_are ( table, column, user, privileges[] )
CREATE OR REPLACE FUNCTION column_privs_are ( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT column_privs_are(
        $1, $2, $3, $4,
        'Role ' || quote_ident($3) || ' should be granted '
            || CASE WHEN $4[1] IS NULL THEN 'no privileges' ELSE array_to_string($4, ', ') END
            || ' on column ' || quote_ident($1) || '.' || quote_ident($2)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_fdw_privs (NAME, TEXT)
RETURNS TEXT[] AS $$
BEGIN
    IF pg_catalog.has_foreign_data_wrapper_privilege($1, $2, 'USAGE') THEN
        RETURN '{USAGE}';
    ELSE
        RETURN '{}';
    END IF;
EXCEPTION WHEN undefined_object THEN
    -- Same error code for unknown user or fdw. So figure out which.
    RETURN CASE WHEN SQLERRM LIKE '%' || $1 || '%' THEN
        '{undefined_role}'
    ELSE
        '{undefined_fdw}'
    END;
END;
$$ LANGUAGE plpgsql;

-- fdw_privs_are ( fdw, user, privileges[], description )
CREATE OR REPLACE FUNCTION fdw_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_fdw_privs( $2, $1::TEXT );
BEGIN
    IF grants[1] = 'undefined_fdw' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    FDW ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- fdw_privs_are ( fdw, user, privileges[] )
CREATE OR REPLACE FUNCTION fdw_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT fdw_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on FDW ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _get_server_privs (NAME, TEXT)
RETURNS TEXT[] AS $$
BEGIN
    IF pg_catalog.has_server_privilege($1, $2, 'USAGE') THEN
        RETURN '{USAGE}';
    ELSE
        RETURN '{}';
    END IF;
EXCEPTION WHEN undefined_object THEN
    -- Same error code for unknown user or server. So figure out which.
    RETURN CASE WHEN SQLERRM LIKE '%' || $1 || '%' THEN
        '{undefined_role}'
    ELSE
        '{undefined_server}'
    END;
END;
$$ LANGUAGE plpgsql;

-- server_privs_are ( server, user, privileges[], description )
CREATE OR REPLACE FUNCTION server_privs_are ( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
DECLARE
    grants TEXT[] := _get_server_privs( $2, $1::TEXT );
BEGIN
    IF grants[1] = 'undefined_server' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Server ' || quote_ident($1) || ' does not exist'
        );
    ELSIF grants[1] = 'undefined_role' THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            '    Role ' || quote_ident($2) || ' does not exist'
        );
    END IF;
    RETURN _assets_are('privileges', grants, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- server_privs_are ( server, user, privileges[] )
CREATE OR REPLACE FUNCTION server_privs_are ( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT server_privs_are(
        $1, $2, $3,
        'Role ' || quote_ident($2) || ' should be granted '
            || CASE WHEN $3[1] IS NULL THEN 'no privileges' ELSE array_to_string($3, ', ') END
            || ' on server ' || quote_ident($1)
    );
$$ LANGUAGE SQL;

-- materialized_views_are( schema, materialized_views, description )
CREATE OR REPLACE FUNCTION materialized_views_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'Materialized views', _extras('m', $1, $2), _missing('m', $1, $2), $3);
$$ LANGUAGE SQL;

-- materialized_views_are( materialized_views, description )
CREATE OR REPLACE FUNCTION materialized_views_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'Materialized views', _extras('m', $1), _missing('m', $1), $2);
$$ LANGUAGE SQL;

-- materialized_views_are( schema, materialized_views )
CREATE OR REPLACE FUNCTION materialized_views_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'Materialized views', _extras('m', $1, $2), _missing('m', $1, $2),
        'Schema ' || quote_ident($1) || ' should have the correct materialized views'
    );
$$ LANGUAGE SQL;

-- materialized_views_are( materialized_views )
CREATE OR REPLACE FUNCTION materialized_views_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'Materialized views', _extras('m', $1), _missing('m', $1),
        'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct materialized views'
    );
$$ LANGUAGE SQL;

-- materialized_view_owner_is ( schema, materialized_view, user, description )
CREATE OR REPLACE FUNCTION materialized_view_owner_is ( NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('m'::char, $1, $2);
BEGIN
    -- Make sure the materialized view exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $4) || E'\n' || diag(
            E'    Materialized view ' || quote_ident($1) || '.' || quote_ident($2) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $3, $4);
END;
$$ LANGUAGE plpgsql;

-- materialized_view_owner_is ( schema, materialized_view, user )
CREATE OR REPLACE FUNCTION materialized_view_owner_is ( NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT materialized_view_owner_is(
        $1, $2, $3,
        'Materialized view ' || quote_ident($1) || '.' || quote_ident($2) || ' should be owned by ' || quote_ident($3)
    );
$$ LANGUAGE sql;

-- materialized_view_owner_is ( materialized_view, user, description )
CREATE OR REPLACE FUNCTION materialized_view_owner_is ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
DECLARE
    owner NAME := _get_rel_owner('m'::char, $1);
BEGIN
    -- Make sure the materialized view exists.
    IF owner IS NULL THEN
        RETURN ok(FALSE, $3) || E'\n' || diag(
            E'    Materialized view ' || quote_ident($1) || ' does not exist'
        );
    END IF;

    RETURN is(owner, $2, $3);
END;
$$ LANGUAGE plpgsql;

-- materialized_view_owner_is ( materialized_view, user )
CREATE OR REPLACE FUNCTION materialized_view_owner_is ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT materialized_view_owner_is(
        $1, $2,
        'Materialized view ' || quote_ident($1) || ' should be owned by ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- has_materialized_view( schema, materialized_view, description )
CREATE OR REPLACE FUNCTION has_materialized_view ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'm', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_materialized_view( materialized_view, description )
CREATE OR REPLACE FUNCTION has_materialized_view ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists( 'm', $1 ), $2 );
$$ LANGUAGE SQL;

-- has_materialized_view( materialized_view )
CREATE OR REPLACE FUNCTION has_materialized_view ( NAME )
RETURNS TEXT AS $$
    SELECT has_materialized_view( $1, 'Materialized view ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_materialized_view( schema, materialized_view, description )
CREATE OR REPLACE FUNCTION hasnt_materialized_view ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'm', $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_materialized_view( materialized_view, description )
CREATE OR REPLACE FUNCTION hasnt_materialized_view ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists( 'm', $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_materialized_view( materialized_view )
CREATE OR REPLACE FUNCTION hasnt_materialized_view ( NAME )
RETURNS TEXT AS $$
    SELECT hasnt_materialized_view( $1, 'Materialized view ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;


-- foreign_tables_are( schema, tables, description )
CREATE OR REPLACE FUNCTION foreign_tables_are ( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'foreign tables', _extras('f', $1, $2), _missing('f', $1, $2), $3);
$$ LANGUAGE SQL;

-- foreign_tables_are( tables, description )
CREATE OR REPLACE FUNCTION foreign_tables_are ( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are( 'foreign tables', _extras('f', $1), _missing('f', $1), $2);
$$ LANGUAGE SQL;

-- foreign_tables_are( schema, tables )
CREATE OR REPLACE FUNCTION foreign_tables_are ( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'foreign tables', _extras('f', $1, $2), _missing('f', $1, $2),
        'Schema ' || quote_ident($1) || ' should have the correct foreign tables'
    );
$$ LANGUAGE SQL;

-- foreign_tables_are( tables )
CREATE OR REPLACE FUNCTION foreign_tables_are ( NAME[] )
RETURNS TEXT AS $$
    SELECT _are(
        'foreign tables', _extras('f', $1), _missing('f', $1),
        'Search path ' || pg_catalog.current_setting('search_path') || ' should have the correct foreign tables'
    );
$$ LANGUAGE SQL;

GRANT SELECT ON tap_funky           TO PUBLIC;
GRANT SELECT ON pg_all_foreign_keys TO PUBLIC;

-- Get extensions in a given schema
CREATE OR REPLACE FUNCTION _extensions( NAME )
RETURNS SETOF NAME AS $$
    SELECT e.extname
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_extension e ON n.oid = e.extnamespace
     WHERE n.nspname = $1
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _extensions()
RETURNS SETOF NAME AS $$
    SELECT extname FROM pg_catalog.pg_extension
$$ LANGUAGE SQL;

-- extensions_are( schema, extensions, description )
CREATE OR REPLACE FUNCTION extensions_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'extensions',
        ARRAY(SELECT _extensions($1) EXCEPT SELECT unnest($2)),
        ARRAY(SELECT unnest($2) EXCEPT SELECT _extensions($1)),
        $3
    );
$$ LANGUAGE SQL;

-- extensions_are( schema, extensions)
CREATE OR REPLACE FUNCTION extensions_are( NAME, NAME[] )
RETURNS TEXT AS $$
  SELECT extensions_are(
        $1, $2,
        'Schema ' || quote_ident($1) || ' should have the correct extensions'
    );
$$ LANGUAGE SQL;

-- extensions_are( extensions, description )
CREATE OR REPLACE FUNCTION extensions_are( NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'extensions',
        ARRAY(SELECT _extensions() EXCEPT SELECT unnest($1)),
        ARRAY(SELECT unnest($1) EXCEPT SELECT _extensions()),
        $2
    );
$$ LANGUAGE SQL;

-- extensions_are( schema, extensions)
CREATE OR REPLACE FUNCTION extensions_are( NAME[] )
RETURNS TEXT AS $$
  SELECT extensions_are($1, 'Should have the correct extensions');
$$ LANGUAGE SQL;

-- check extension exists function with schema name
CREATE OR REPLACE FUNCTION _ext_exists( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
        SELECT TRUE
          FROM pg_catalog.pg_extension ex
          JOIN pg_catalog.pg_namespace n ON ex.extnamespace = n.oid
         WHERE n.nspname  = $1
           AND ex.extname = $2
    );
$$ LANGUAGE SQL;

-- check extension exists function without schema name
CREATE OR REPLACE FUNCTION _ext_exists( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS (
        SELECT TRUE
          FROM pg_catalog.pg_extension ex
         WHERE ex.extname = $1
    );
$$ LANGUAGE SQL;

-- has_extension( schema, name, description )
CREATE OR REPLACE FUNCTION has_extension( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ext_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- has_extension( schema, name )
CREATE OR REPLACE FUNCTION has_extension( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ext_exists( $1, $2 ),
        'Extension ' || quote_ident($2)
        || ' should exist in schema ' || quote_ident($1) );
$$ LANGUAGE SQL;

-- has_extension( name, description )
CREATE OR REPLACE FUNCTION has_extension( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ext_exists( $1 ), $2)
$$ LANGUAGE SQL;

-- has_extension( name )
CREATE OR REPLACE FUNCTION has_extension( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ext_exists( $1 ),
        'Extension ' || quote_ident($1) || ' should exist' );
$$ LANGUAGE SQL;

-- hasnt_extension( schema, name, description )
CREATE OR REPLACE FUNCTION hasnt_extension( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _ext_exists( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_extension( schema, name )
CREATE OR REPLACE FUNCTION hasnt_extension( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _ext_exists( $1, $2 ),
        'Extension ' || quote_ident($2)
        || ' should not exist in schema ' || quote_ident($1) );
$$ LANGUAGE SQL;

-- hasnt_extension( name, description )
CREATE OR REPLACE FUNCTION hasnt_extension( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _ext_exists( $1 ), $2)
$$ LANGUAGE SQL;

-- hasnt_extension( name )
CREATE OR REPLACE FUNCTION hasnt_extension( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _ext_exists( $1 ),
        'Extension ' || quote_ident($1) || ' should not exist' );
$$ LANGUAGE SQL;

-- is_partitioned( schema, table, description )
CREATE OR REPLACE FUNCTION is_partitioned ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists('p', $1, $2), $3);
$$ LANGUAGE sql;

-- is_partitioned( schema, table )
CREATE OR REPLACE FUNCTION is_partitioned ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _rexists('p', $1, $2),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should be partitioned'
    );
$$ LANGUAGE sql;

-- is_partitioned( table, description )
CREATE OR REPLACE FUNCTION is_partitioned ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _rexists('p', $1), $2);
$$ LANGUAGE sql;

-- is_partitioned( table )
CREATE OR REPLACE FUNCTION is_partitioned ( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _rexists('p', $1),
        'Table ' || quote_ident($1) || ' should be partitioned'
    );
$$ LANGUAGE sql;

-- isnt_partitioned( schema, table, description )
CREATE OR REPLACE FUNCTION isnt_partitioned ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists('p', $1, $2), $3);
$$ LANGUAGE sql;

-- isnt_partitioned( schema, table )
CREATE OR REPLACE FUNCTION isnt_partitioned ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _rexists('p', $1, $2),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should not be partitioned'
    );
$$ LANGUAGE sql;

-- isnt_partitioned( table, description )
CREATE OR REPLACE FUNCTION isnt_partitioned ( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _rexists('p', $1), $2);
$$ LANGUAGE sql;

-- isnt_partitioned( table )
CREATE OR REPLACE FUNCTION isnt_partitioned ( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _rexists('p', $1),
        'Table ' || quote_ident($1) || ' should not be partitioned'
    );
$$ LANGUAGE sql;

-- _partof( child_schema, child_table, parent_schema, parent_table )
CREATE OR REPLACE FUNCTION _partof ( NAME, NAME, NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace cn
          JOIN pg_catalog.pg_class cc ON cn.oid = cc.relnamespace
          JOIN pg_catalog.pg_inherits i ON cc.oid = i.inhrelid
          JOIN pg_catalog.pg_class pc ON i.inhparent = pc.oid
          JOIN pg_catalog.pg_namespace pn ON pc.relnamespace = pn.oid
         WHERE cn.nspname = $1
           AND cc.relname = $2
           AND cc.relispartition
           AND pn.nspname = $3
           AND pc.relname = $4
           AND pc.relkind = 'p'
    )
$$ LANGUAGE sql;

-- _partof( child_table, parent_table )
CREATE OR REPLACE FUNCTION _partof ( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_class cc
          JOIN pg_catalog.pg_inherits i ON cc.oid = i.inhrelid
          JOIN pg_catalog.pg_class pc ON i.inhparent = pc.oid
         WHERE cc.relname = $1
           AND cc.relispartition
           AND pc.relname = $2
           AND pc.relkind = 'p'
           AND pg_catalog.pg_table_is_visible(cc.oid)
           AND pg_catalog.pg_table_is_visible(pc.oid)
    )
$$ LANGUAGE sql;

-- is_partition_of( child_schema, child_table, parent_schema, parent_table, description )
CREATE OR REPLACE FUNCTION is_partition_of ( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _partof($1, $2, $3, $4), $5);
$$ LANGUAGE sql;

-- is_partition_of( child_schema, child_table, parent_schema, parent_table )
CREATE OR REPLACE FUNCTION is_partition_of ( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _partof($1, $2, $3, $4),
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should be a partition of '
        || quote_ident($3) || '.' || quote_ident($4)
    );
$$ LANGUAGE sql;

-- is_partition_of( child_table, parent_table, description )
CREATE OR REPLACE FUNCTION is_partition_of ( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _partof($1, $2), $3);
$$ LANGUAGE sql;

-- is_partition_of( child_table, parent_table )
CREATE OR REPLACE FUNCTION is_partition_of ( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _partof($1, $2),
        'Table ' || quote_ident($1) || ' should be a partition of ' || quote_ident($2)
    );
$$ LANGUAGE sql;

-- _parts(schema, table)
CREATE OR REPLACE FUNCTION _parts( NAME, NAME )
RETURNS SETOF NAME AS $$
    SELECT i.inhrelid::regclass::name
      FROM pg_catalog.pg_namespace n
      JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
      JOIN pg_catalog.pg_inherits i ON c.oid = i.inhparent
     WHERE n.nspname = $1
       AND c.relname = $2
       AND c.relkind = 'p'
$$ LANGUAGE SQL;

-- _parts(table)
CREATE OR REPLACE FUNCTION _parts( NAME )
RETURNS SETOF NAME AS $$
    SELECT i.inhrelid::regclass::name
      FROM pg_catalog.pg_class c
      JOIN pg_catalog.pg_inherits i ON c.oid = i.inhparent
     WHERE c.relname = $1
       AND c.relkind = 'p'
       AND pg_catalog.pg_table_is_visible(c.oid)
$$ LANGUAGE SQL;

-- partitions_are( schema, table, partitions, description )
CREATE OR REPLACE FUNCTION partitions_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'partitions',
        ARRAY(SELECT _parts($1, $2) EXCEPT SELECT unnest($3)),
        ARRAY(SELECT unnest($3) EXCEPT SELECT _parts($1, $2)),
        $4
    );
$$ LANGUAGE SQL;

-- partitions_are( schema, table, partitions )
CREATE OR REPLACE FUNCTION partitions_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT partitions_are(
        $1, $2, $3,
        'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct partitions'
    );
$$ LANGUAGE SQL;

-- partitions_are( table, partitions, description )
CREATE OR REPLACE FUNCTION partitions_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'partitions',
        ARRAY(SELECT _parts($1) EXCEPT SELECT unnest($2)),
        ARRAY(SELECT unnest($2) EXCEPT SELECT _parts($1)),
        $3
    );
$$ LANGUAGE SQL;

-- partitions_are( table, partitions )
CREATE OR REPLACE FUNCTION partitions_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT partitions_are(
        $1, $2,
        'Table ' || quote_ident($1) || ' should have the correct partitions'
    );
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION _ident_array_to_sorted_string( name[], text )
RETURNS text AS $$
    SELECT array_to_string(ARRAY(
        SELECT quote_ident($1[i])
          FROM generate_series(1, array_upper($1, 1)) s(i)
         ORDER BY $1[i]
    ), $2);
$$ LANGUAGE SQL immutable;

CREATE OR REPLACE FUNCTION _array_to_sorted_string( name[], text )
RETURNS text AS $$
    SELECT array_to_string(ARRAY(
        SELECT $1[i]
          FROM generate_series(1, array_upper($1, 1)) s(i)
         ORDER BY $1[i]
    ), $2);
$$ LANGUAGE SQL immutable;

-- policies_are( schema, table, policies[], description )
CREATE OR REPLACE FUNCTION policies_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'policies',
        ARRAY(
            SELECT p.polname
              FROM pg_catalog.pg_policy p
              JOIN pg_catalog.pg_class c     ON c.oid = p.polrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE n.nspname = $1
               AND c.relname = $2
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT p.polname
              FROM pg_catalog.pg_policy p
              JOIN pg_catalog.pg_class c     ON c.oid = p.polrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE n.nspname = $1
               AND c.relname = $2
        ),
        $4
    );
$$ LANGUAGE SQL;

-- policies_are( schema, table, policies[] )
CREATE OR REPLACE FUNCTION policies_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT policies_are( $1, $2, $3, 'Table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct policies' );
$$ LANGUAGE SQL;

-- policies_are( table, policies[], description )
CREATE OR REPLACE FUNCTION policies_are( NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'policies',
        ARRAY(
            SELECT p.polname
              FROM pg_catalog.pg_policy p
              JOIN pg_catalog.pg_class c ON c.oid = p.polrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
             WHERE c.relname = $1
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
            EXCEPT
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
        ),
        ARRAY(
            SELECT $2[i]
              FROM generate_series(1, array_upper($2, 1)) s(i)
            EXCEPT
            SELECT p.polname
              FROM pg_catalog.pg_policy p
              JOIN pg_catalog.pg_class c ON c.oid = p.polrelid
              JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
               AND n.nspname NOT IN ('pg_catalog', 'information_schema')
        ),
        $3
    );
$$ LANGUAGE SQL;

-- policies_are( table, policies[] )
CREATE OR REPLACE FUNCTION policies_are( NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT policies_are( $1, $2, 'Table ' || quote_ident($1) || ' should have the correct policies' );
$$ LANGUAGE SQL;

-- policy_roles_are( schema, table, policy, roles[], description )
CREATE OR REPLACE FUNCTION policy_roles_are( NAME, NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'policy roles',
        ARRAY(
            SELECT pr.rolname
              FROM pg_catalog.pg_policy AS pp
              JOIN pg_catalog.pg_roles AS pr ON pr.oid = ANY (pp.polroles)
              JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
              JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
             WHERE pn.nspname = $1
               AND pc.relname = $2
               AND pp.polname = $3
            EXCEPT
            SELECT $4[i]
              FROM generate_series(1, array_upper($4, 1)) s(i)
        ),
        ARRAY(
            SELECT $4[i]
              FROM generate_series(1, array_upper($4, 1)) s(i)
            EXCEPT
            SELECT pr.rolname
              FROM pg_catalog.pg_policy AS pp
              JOIN pg_catalog.pg_roles AS pr ON pr.oid = ANY (pp.polroles)
              JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
              JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
             WHERE pn.nspname = $1
               AND pc.relname = $2
               AND pp.polname = $3
        ),
        $5
    );
$$ LANGUAGE SQL;

-- policy_roles_are( schema, table, policy, roles[] )
CREATE OR REPLACE FUNCTION policy_roles_are( NAME, NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT policy_roles_are( $1, $2, $3, $4, 'Policy ' || quote_ident($3) || ' for table ' || quote_ident($1) || '.' || quote_ident($2) || ' should have the correct roles' );
$$ LANGUAGE SQL;

-- policy_roles_are( table, policy, roles[], description )
CREATE OR REPLACE FUNCTION policy_roles_are( NAME, NAME, NAME[], TEXT )
RETURNS TEXT AS $$
    SELECT _are(
        'policy roles',
        ARRAY(
            SELECT pr.rolname
              FROM pg_catalog.pg_policy AS pp
              JOIN pg_catalog.pg_roles AS pr ON pr.oid = ANY (pp.polroles)
              JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
              JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
             WHERE pc.relname = $1
               AND pp.polname = $2
               AND pn.nspname NOT IN ('pg_catalog', 'information_schema')
            EXCEPT
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
        ),
        ARRAY(
            SELECT $3[i]
              FROM generate_series(1, array_upper($3, 1)) s(i)
            EXCEPT
            SELECT pr.rolname
              FROM pg_catalog.pg_policy AS pp
              JOIN pg_catalog.pg_roles AS pr ON pr.oid = ANY (pp.polroles)
              JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
              JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
             WHERE pc.relname = $1
               AND pp.polname = $2
               AND pn.nspname NOT IN ('pg_catalog', 'information_schema')
        ),
        $4
    );
$$ LANGUAGE SQL;

-- policy_roles_are( table, policy, roles[] )
CREATE OR REPLACE FUNCTION policy_roles_are( NAME, NAME, NAME[] )
RETURNS TEXT AS $$
    SELECT policy_roles_are( $1, $2, $3, 'Policy ' || quote_ident($2) || ' for table ' || quote_ident($1) || ' should have the correct roles' );
$$ LANGUAGE SQL;

-- policy_cmd_is( schema, table, policy, command, description )
CREATE OR REPLACE FUNCTION policy_cmd_is( NAME, NAME, NAME, text, text )
RETURNS TEXT AS $$
DECLARE
    cmd text;
BEGIN
    SELECT
      CASE pp.polcmd WHEN 'r' THEN 'SELECT'
                     WHEN 'a' THEN 'INSERT'
                     WHEN 'w' THEN 'UPDATE'
                     WHEN 'd' THEN 'DELETE'
                     ELSE 'ALL'
       END
      FROM pg_catalog.pg_policy AS pp
      JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
      JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
     WHERE pn.nspname = $1
       AND pc.relname = $2
       AND pp.polname = $3
      INTO cmd;

    RETURN is( cmd, upper($4), $5 );
END;
$$ LANGUAGE plpgsql;

-- policy_cmd_is( schema, table, policy, command )
CREATE OR REPLACE FUNCTION policy_cmd_is( NAME, NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT policy_cmd_is(
        $1, $2, $3, $4,
        'Policy ' || quote_ident($3)
        || ' for table ' || quote_ident($1) || '.' || quote_ident($2)
        || ' should apply to ' || upper($4) || ' command'
    );
$$ LANGUAGE sql;

-- policy_cmd_is( table, policy, command, description )
CREATE OR REPLACE FUNCTION policy_cmd_is( NAME, NAME, text, text )
RETURNS TEXT AS $$
DECLARE
    cmd text;
BEGIN
    SELECT
      CASE pp.polcmd WHEN 'r' THEN 'SELECT'
                     WHEN 'a' THEN 'INSERT'
                     WHEN 'w' THEN 'UPDATE'
                     WHEN 'd' THEN 'DELETE'
                     ELSE 'ALL'
       END
      FROM pg_catalog.pg_policy AS pp
      JOIN pg_catalog.pg_class AS pc ON pc.oid = pp.polrelid
      JOIN pg_catalog.pg_namespace AS pn ON pn.oid = pc.relnamespace
     WHERE pc.relname = $1
       AND pp.polname = $2
       AND pn.nspname NOT IN ('pg_catalog', 'information_schema')
      INTO cmd;

    RETURN is( cmd, upper($3), $4 );
END;
$$ LANGUAGE plpgsql;

-- policy_cmd_is( table, policy, command )
CREATE OR REPLACE FUNCTION policy_cmd_is( NAME, NAME, text )
RETURNS TEXT AS $$
    SELECT policy_cmd_is(
        $1, $2, $3,
        'Policy ' || quote_ident($2)
        || ' for table ' || quote_ident($1)
        || ' should apply to ' || upper($3) || ' command'
    );
$$ LANGUAGE sql;

/******************** INHERITANCE ***********************************************/
/*
 * Internal function to test whether the specified table in the specified schema
 * has an inheritance chain. Returns true or false.
 */
CREATE OR REPLACE FUNCTION _inherited( NAME, NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_namespace n
          JOIN pg_catalog.pg_class c ON n.oid = c.relnamespace
         WHERE c.relkind = 'r'
           AND n.nspname = $1
           AND c.relname = $2
           AND c.relhassubclass = true
  );
$$ LANGUAGE SQL;

/*
 * Internal function to test whether a specific table in the search_path has an
 * inheritance chain. Returns true or false.
 */
CREATE OR REPLACE FUNCTION _inherited( NAME )
RETURNS BOOLEAN AS $$
    SELECT EXISTS(
        SELECT true
          FROM pg_catalog.pg_class c
         WHERE c.relkind = 'r'
           AND pg_catalog.pg_table_is_visible( c.oid )
           AND c.relname = $1
           AND c.relhassubclass = true
    );
$$ LANGUAGE SQL;

-- has_inherited_tables( schema, table, description )
CREATE OR REPLACE FUNCTION has_inherited_tables( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _inherited( $1, $2 ), $3);
$$ LANGUAGE SQL;

-- has_inherited_tables( schema, table )
CREATE OR REPLACE FUNCTION has_inherited_tables( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _inherited( $1, $2 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 ) || ' should have descendents'
    );
$$ LANGUAGE SQL;

-- has_inherited_tables( table, description )
CREATE OR REPLACE FUNCTION has_inherited_tables( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _inherited( $1 ), $2 );
$$ LANGUAGE SQL;

-- has_inherited_tables( table )
CREATE OR REPLACE FUNCTION has_inherited_tables( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _inherited( $1 ),
        'Table ' || quote_ident( $1 ) || ' should have descendents'
    );
$$ LANGUAGE SQL;

-- hasnt_inherited_tables( schema, table, description )
CREATE OR REPLACE FUNCTION hasnt_inherited_tables( NAME, NAME, TEXT )
RETURNS TEXT AS $$
       SELECT ok( NOT _inherited( $1, $2 ), $3 );
$$ LANGUAGE SQL;

-- hasnt_inherited_tables( schema, table )
CREATE OR REPLACE FUNCTION hasnt_inherited_tables( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _inherited( $1, $2 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 ) || ' should not have descendents'
    );
$$ LANGUAGE SQL;

-- hasnt_inherited_tables( table, description )
CREATE OR REPLACE FUNCTION hasnt_inherited_tables( NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT _inherited( $1 ), $2 );
$$ LANGUAGE SQL;

-- hasnt_inherited_tables( table )
CREATE OR REPLACE FUNCTION hasnt_inherited_tables( NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT _inherited( $1 ),
        'Table ' || quote_ident( $1 ) || ' should not have descendents'
    );
$$ LANGUAGE SQL;

/*
* Internal function to test whether the schema-qualified table is an ancestor of
* the other schema-qualified table. The integer value is the length of the
* inheritance chain: a direct ancestor has has a chain length of 1.
*/
CREATE OR REPLACE FUNCTION _ancestor_of( NAME, NAME, NAME, NAME, INT )
RETURNS BOOLEAN AS $$
    WITH RECURSIVE inheritance_chain AS (
        -- select the ancestor tuple
        SELECT i.inhrelid AS descendent_id, 1 AS inheritance_level
          FROM pg_catalog.pg_inherits i
        WHERE i.inhparent = (
            SELECT c1.oid
              FROM pg_catalog.pg_class c1
              JOIN pg_catalog.pg_namespace n1
                ON c1.relnamespace = n1.oid
             WHERE c1.relname = $2
               AND n1.nspname = $1
        )
        UNION
        -- select the descendents
        SELECT i.inhrelid AS descendent_id,
               p.inheritance_level + 1 AS inheritance_level
          FROM pg_catalog.pg_inherits i
          JOIN inheritance_chain p
            ON p.descendent_id = i.inhparent
         WHERE i.inhrelid = (
            SELECT c1.oid
              FROM pg_catalog.pg_class c1
              JOIN pg_catalog.pg_namespace n1
                ON c1.relnamespace = n1.oid
             WHERE c1.relname = $4
               AND n1.nspname = $3
        )
    )
    SELECT EXISTS(
        SELECT true
          FROM inheritance_chain
         WHERE inheritance_level = COALESCE($5, inheritance_level)
           AND descendent_id = (
                SELECT c1.oid
                  FROM pg_catalog.pg_class c1
                  JOIN pg_catalog.pg_namespace n1
                    ON c1.relnamespace = n1.oid
                 WHERE c1.relname = $4
                   AND n1.nspname = $3
        )
    );
$$ LANGUAGE SQL;

/*
 * Internal function to check if not-qualified tables
 * within the search_path are connected by an inheritance chain.
 */
CREATE OR REPLACE FUNCTION _ancestor_of( NAME, NAME, INT )
RETURNS BOOLEAN AS $$
    WITH RECURSIVE inheritance_chain AS (
        -- select the ancestor tuple
        SELECT i.inhrelid AS descendent_id, 1 AS inheritance_level
          FROM pg_catalog.pg_inherits i
        WHERE i.inhparent = (
            SELECT c1.oid
              FROM pg_catalog.pg_class c1
              JOIN pg_catalog.pg_namespace n1
                ON c1.relnamespace = n1.oid
             WHERE c1.relname = $1
               AND pg_catalog.pg_table_is_visible( c1.oid )
        )
        UNION
        -- select the descendents
        SELECT i.inhrelid AS descendent_id,
               p.inheritance_level + 1 AS inheritance_level
          FROM pg_catalog.pg_inherits i
          JOIN inheritance_chain p
            ON p.descendent_id = i.inhparent
         WHERE i.inhrelid = (
            SELECT c1.oid
              FROM pg_catalog.pg_class c1
              JOIN pg_catalog.pg_namespace n1
                ON c1.relnamespace = n1.oid
             WHERE c1.relname = $2
               AND pg_catalog.pg_table_is_visible( c1.oid )
        )
    )
    SELECT EXISTS(
        SELECT true
          FROM inheritance_chain
         WHERE inheritance_level = COALESCE($3, inheritance_level)
           AND descendent_id = (
                SELECT c1.oid
                  FROM pg_catalog.pg_class c1
                  JOIN pg_catalog.pg_namespace n1
                    ON c1.relnamespace = n1.oid
                 WHERE c1.relname = $2
                   AND pg_catalog.pg_table_is_visible( c1.oid )
        )
    );
$$ LANGUAGE SQL;

-- is_ancestor_of( schema, table, schema, table, depth, description )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $1, $2, $3, $4, $5 ), $6 );
$$ LANGUAGE SQL;

-- is_ancestor_of( schema, table, schema, table, depth )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $1, $2, $3, $4, $5 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should be ancestor ' || $5 || ' for '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- is_ancestor_of( schema, table, schema, table, description )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $1, $2, $3, $4, NULL ), $5 );
$$ LANGUAGE SQL;

-- is_ancestor_of( schema, table, schema, table )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $1, $2, $3, $4, NULL ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should be an ancestor of '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- is_ancestor_of( table, table, depth, description )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- is_ancestor_of( table, table, depth )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $1, $2, $3 ),
        'Table ' || quote_ident( $1 ) || ' should be ancestor ' || $3 || ' of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- is_ancestor_of( table, table, description )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $1, $2, NULL ), $3 );
$$ LANGUAGE SQL;

-- is_ancestor_of( table, table )
CREATE OR REPLACE FUNCTION is_ancestor_of( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $1, $2, NULL ),
        'Table ' || quote_ident( $1 ) || ' should be an ancestor of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( schema, table, schema, table, depth, description )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT  _ancestor_of( $1, $2, $3, $4, $5 ), $6 );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( schema, table, schema, table, depth )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        NOT  _ancestor_of( $1, $2, $3, $4, $5 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should not be ancestor ' || $5 || ' for '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( schema, table, schema, table, description )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT  _ancestor_of( $1, $2, $3, $4, NULL ), $5 );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( schema, table, schema, table )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT  _ancestor_of( $1, $2, $3, $4, NULL ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should not be an ancestor of '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( table, table, depth, description )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT  _ancestor_of( $1, $2, $3 ), $4 );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( table, table, depth )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        NOT  _ancestor_of( $1, $2, $3 ),
        'Table ' || quote_ident( $1 ) || ' should not be ancestor ' || $3 || ' of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( table, table, description )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( NOT  _ancestor_of( $1, $2, NULL ), $3 );
$$ LANGUAGE SQL;

-- isnt_ancestor_of( table, table )
CREATE OR REPLACE FUNCTION isnt_ancestor_of( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        NOT  _ancestor_of( $1, $2, NULL ),
        'Table ' || quote_ident( $1 ) || ' should not be an ancestor of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- is_descendent_of( schema, table, schema, table, depth, description )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $3, $4, $1, $2, $5 ), $6 );
$$ LANGUAGE SQL;

-- is_descendent_of( schema, table, schema, table, depth )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $3, $4, $1, $2, $5 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should be descendent ' || $5 || ' from '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- is_descendent_of( schema, table, schema, table, description )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $3, $4, $1, $2, NULL ), $5 );
$$ LANGUAGE SQL;

-- is_descendent_of( schema, table, schema, table )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $3, $4, $1, $2, NULL ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should be a descendent of '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- is_descendent_of( table, table, depth, description )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $2, $1, $3 ), $4 );
$$ LANGUAGE SQL;

-- is_descendent_of( table, table, depth )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $2, $1, $3 ),
        'Table ' || quote_ident( $1 ) || ' should be descendent ' || $3 || ' from ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- is_descendent_of( table, table, description )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok( _ancestor_of( $2, $1, NULL ), $3 );
$$ LANGUAGE SQL;

-- is_descendent_of( table, table )
CREATE OR REPLACE FUNCTION is_descendent_of( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
        _ancestor_of( $2, $1, NULL ),
        'Table ' || quote_ident( $1 ) || ' should be a descendent of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- isnt_descendent_of( schema, table, schema, table, depth, description )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok(NOT  _ancestor_of( $3, $4, $1, $2, $5 ), $6 );
$$ LANGUAGE SQL;

-- isnt_descendent_of( schema, table, schema, table, depth )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
       NOT  _ancestor_of( $3, $4, $1, $2, $5 ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should not be descendent ' || $5 || ' from '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- isnt_descendent_of( schema, table, schema, table, description )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(NOT  _ancestor_of( $3, $4, $1, $2, NULL ), $5 );
$$ LANGUAGE SQL;

-- isnt_descendent_of( schema, table, schema, table )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
       NOT  _ancestor_of( $3, $4, $1, $2, NULL ),
        'Table ' || quote_ident( $1 ) || '.' || quote_ident( $2 )
        || ' should not be a descendent of '
        || quote_ident( $3 ) || '.' || quote_ident( $4 )
    );
$$ LANGUAGE SQL;

-- isnt_descendent_of( table, table, depth, description )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, INT, TEXT )
RETURNS TEXT AS $$
    SELECT ok(NOT  _ancestor_of( $2, $1, $3 ), $4 );
$$ LANGUAGE SQL;

-- isnt_descendent_of( table, table, depth )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, INT )
RETURNS TEXT AS $$
    SELECT ok(
       NOT  _ancestor_of( $2, $1, $3 ),
        'Table ' || quote_ident( $1 ) || ' should not be descendent ' || $3 || ' from ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;

-- isnt_descendent_of( table, table, description )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME, TEXT )
RETURNS TEXT AS $$
    SELECT ok(NOT  _ancestor_of( $2, $1, NULL ), $3 );
$$ LANGUAGE SQL;

-- isnt_descendent_of( table, table )
CREATE OR REPLACE FUNCTION isnt_descendent_of( NAME, NAME )
RETURNS TEXT AS $$
    SELECT ok(
       NOT  _ancestor_of( $2, $1, NULL ),
        'Table ' || quote_ident( $1 ) || ' should not be a descendent of ' || quote_ident( $2)
    );
$$ LANGUAGE SQL;