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* Add extentions pg_trgm, unaccent, btree_gin repectively for trigram fuzzy search, unaccenting strings and using gin index. * Add column tokens TSVECTOR to alias table to add tokenized names. * Add view master_entities to extract all the master entities. * Add materialized view search_mv holding all the search relevant information about master entities. * Add materialized view search_words_mv for all unique tokens (used to suggest the next best query). * Index fts_search_idx on materialized view search_mv column tokens to for quick FTS. * Add view untokenized_names holding all master entities with empty tokens, signifying unsupported names by to_tsvector. * Index untokenized_names_idx on materialized view search_mv column names to aid quick view untokenized_names query. * Unique indexes on search_mv and search_words_mv to aid REFRESH CONCURRENTLY command.
* Add function token_creator to tokenized name and enter it as token field in
alias table
* Add function refresh_mv which refreshes all materialized views linked with
FTS - search_mv and search_words_mv
* Add triggers for insert/update on each entity_header to call the refresh_mv
function each time a new entity is inserted or updated (master revision).
* Add trigger for insert on alias to call function token_creator.
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Migration script for making necessary changes to support Postgres FTS.
@LordSputnik Open for review.