Add explicit arrow_type examples to example functions

.beads/issues.jsonl

@@ -47,7 +47,7 @@
 {"id":"vgi-python-lec","title":"Add test coverage for testing.py helper edge cases","notes":"Coverage: 89% in vgi/testing.py. Missing tests for:\n- Lines 421-422, 450-451: StopIteration handling in _process_batch\n- Lines 468-472: FINISHED status during data phase\n- Lines 485-486, 502-503: _finalize edge cases\n\nLow priority since these are test helpers.","status":"closed","priority":4,"issue_type":"task","created_at":"2026-01-04T22:15:34.006563-05:00","created_by":"rusty","updated_at":"2026-01-05T12:07:48.026786-05:00","closed_at":"2026-01-05T12:07:48.026786-05:00","close_reason":"Closed"}
 {"id":"vgi-python-lzc","title":"Extract duplicated sort_key function in argument_spec","description":"The sort_key function is duplicated at lines 139-142 and 309-312 in argument_spec.py. Extract it to a module-level function to follow DRY principles.","status":"closed","priority":3,"issue_type":"task","created_at":"2026-01-05T11:51:19.141041-05:00","created_by":"rusty","updated_at":"2026-01-05T11:55:22.535816-05:00","closed_at":"2026-01-05T11:55:22.535816-05:00","close_reason":"Closed"}
 {"id":"vgi-python-m45","title":"Create tests/test_argument_spec.py","description":"## Overview\n\nCreate comprehensive tests for the argument specification serialization module.\n\n## File Location\n\n`tests/test_argument_spec.py`\n\n## Test Classes and Cases\n\n### TestArgumentSpecToSchema\n\nTest converting ArgumentSpec objects to Arrow schema.\n\n#### test_positional_arguments_preserve_order\n- Create specs with positions 0, 1, 2\n- Convert to schema\n- Verify field order matches position order\n- Verify field types are preserved\n\n#### test_named_arguments_have_metadata\n- Create spec with position='key' (named)\n- Convert to schema\n- Verify field has `vgi_arg=named` metadata\n\n#### test_mixed_positional_and_named\n- Create mix of positional (0, 1) and named ('format', 'verbose') specs\n- Convert to schema\n- Verify positional come first, then named\n- Verify named have correct metadata\n\n#### test_table_input_uses_null_type\n- Create spec with is_table_input=True\n- Convert to schema\n- Verify field type is pa.null()\n- Verify field has `vgi_type=table` metadata\n\n#### test_any_type_uses_null_type\n- Create spec with is_any_type=True\n- Convert to schema\n- Verify field type is pa.null()\n- Verify field has `vgi_type=any` metadata\n\n#### test_varargs_has_metadata\n- Create spec with is_varargs=True and arrow_type=pa.int64()\n- Convert to schema\n- Verify field type is pa.int64() (element type preserved)\n- Verify field has `vgi_varargs=true` metadata\n\n### TestSchemaToArgumentSpecs\n\nTest converting Arrow schema back to ArgumentSpec objects.\n\n#### test_positional_arguments_from_schema\n- Create schema with 3 fields (no metadata)\n- Convert to specs\n- Verify positions are 0, 1, 2\n\n#### test_named_arguments_from_metadata\n- Create schema with `vgi_arg=named` metadata on fields\n- Convert to specs\n- Verify position is field name string\n\n#### test_table_input_detected\n- Create schema with `vgi_type=table` metadata\n- Convert to specs\n- Verify is_table_input=True\n\n#### test_any_type_detected\n- Create schema with `vgi_type=any` metadata\n- Convert to specs\n- Verify is_any_type=True\n\n#### test_varargs_detected\n- Create schema with `vgi_varargs=true` metadata\n- Convert to specs\n- Verify is_varargs=True\n\n### TestRoundTrip\n\nTest that specs survive serialization round-trip.\n\n#### test_complex_arrow_types_preserved\nTest each of these types round-trips correctly:\n- pa.int64(), pa.float32(), pa.utf8()\n- pa.list_(pa.float64())\n- pa.struct([pa.field('a', pa.int32()), pa.field('b', pa.string())])\n- pa.map_(pa.string(), pa.int64())\n- pa.decimal128(10, 2)\n- pa.timestamp('us', tz='UTC')\n\n#### test_full_function_signature_roundtrip\n- Create specs matching a realistic function:\n  - count: int, position 0\n  - data: TableInput, position 1\n  - extra: float varargs, position 2\n  - format: str, named 'format'\n- Convert to schema, serialize to bytes, deserialize, convert back to specs\n- Verify all specs match original\n\n### TestExtractArgumentSpecs\n\nTest extracting specs from function classes.\n\n#### test_extract_from_simple_function\n- Define function class with Arg descriptors\n- Call extract_argument_specs with arg_types dict\n- Verify specs match descriptors\n\n#### test_extract_table_input\n- Define function with Arg[TableInput]\n- Extract specs\n- Verify is_table_input=True\n\n#### test_extract_any_arrow\n- Define function with Arg[AnyArrow]\n- Extract specs\n- Verify is_any_type=True\n\n#### test_extract_varargs\n- Define function with Arg[int](2, varargs=True)\n- Extract specs\n- Verify is_varargs=True\n\n### TestEdgeCases\n\n#### test_empty_schema\n- Convert empty list of specs to schema\n- Verify empty schema works\n- Convert back, verify empty list\n\n#### test_only_named_arguments\n- Create specs with only named arguments (no positional)\n- Round-trip and verify\n\n#### test_only_positional_arguments\n- Create specs with only positional arguments (no named)\n- Round-trip and verify\n\n## Test Utilities\n\nConsider creating fixtures for common patterns:\n- `make_spec()` helper for creating ArgumentSpec\n- Sample function classes for extraction tests","status":"closed","priority":2,"issue_type":"task","created_at":"2026-01-05T11:18:53.312911-05:00","created_by":"rusty","updated_at":"2026-01-05T11:32:35.580879-05:00","closed_at":"2026-01-05T11:32:35.580879-05:00","close_reason":"Created comprehensive tests with 43 passing test cases","dependencies":[{"issue_id":"vgi-python-m45","depends_on_id":"vgi-python-cd0","type":"blocks","created_at":"2026-01-05T11:19:30.779207-05:00","created_by":"rusty"}]}
-{"id":"vgi-python-n2b","title":"Update example functions with explicit arrow_type","description":"Update a subset of example functions to demonstrate explicit arrow_type:\n\n- vgi/examples/table.py: RangeFunction.step → arrow_type=pa.int32()\n- vgi/examples/scalar.py: One function → explicit arrow_type\n\nMost examples keep Arg[int](0) to test auto-inference.","status":"open","priority":2,"issue_type":"task","created_at":"2026-01-05T15:44:57.188629-05:00","created_by":"rusty","updated_at":"2026-01-05T15:44:57.188629-05:00","dependencies":[{"issue_id":"vgi-python-n2b","depends_on_id":"vgi-python-dv0","type":"blocks","created_at":"2026-01-05T15:45:14.330881-05:00","created_by":"rusty"}]}
+{"id":"vgi-python-n2b","title":"Update example functions with explicit arrow_type","description":"Update a subset of example functions to demonstrate explicit arrow_type:\n\n- vgi/examples/table.py: RangeFunction.step → arrow_type=pa.int32()\n- vgi/examples/scalar.py: One function → explicit arrow_type\n\nMost examples keep Arg[int](0) to test auto-inference.","status":"closed","priority":2,"issue_type":"task","created_at":"2026-01-05T15:44:57.188629-05:00","created_by":"rusty","updated_at":"2026-01-05T15:58:26.384255-05:00","closed_at":"2026-01-05T15:58:26.384255-05:00","close_reason":"PR #21 created","dependencies":[{"issue_id":"vgi-python-n2b","depends_on_id":"vgi-python-dv0","type":"blocks","created_at":"2026-01-05T15:45:14.330881-05:00","created_by":"rusty"}]}
 {"id":"vgi-python-odi","title":"Change max_processes from method to property in Function hierarchy","description":"Refactor max_processes from a method to a property across the Function class hierarchy (Function, ScalarFunction, TableFunctionGenerator, TableInOutFunction, etc.). This makes the API more consistent since max_processes is effectively a constant per function class and properties are more idiomatic for such values.","status":"closed","priority":2,"issue_type":"task","created_at":"2026-01-04T11:25:29.750648-05:00","created_by":"rusty","updated_at":"2026-01-04T11:50:57.566545-05:00","closed_at":"2026-01-04T11:50:57.566545-05:00","close_reason":"Closed"}
 {"id":"vgi-python-p91","title":"Move exception classes from function.py to own file","description":"Move InitIdentifierError and SchemaValidationError from vgi/function.py to a new vgi/exceptions.py file. Update imports in function.py and any other files that reference these exceptions.","status":"closed","priority":2,"issue_type":"task","created_at":"2026-01-04T09:12:28.058227-05:00","created_by":"rusty","updated_at":"2026-01-04T09:17:52.477661-05:00","closed_at":"2026-01-04T09:17:52.477661-05:00","close_reason":"Closed"}
 {"id":"vgi-python-qud","title":"Test FunctionStorageSqlite: global_delete, global_exists, queue_clear","notes":"Coverage: 83% in vgi/function_storage.py. Missing tests for:\n- Line 266: KeyError path in global_get (key not found)\n- Lines 273-278: global_delete method\n- Lines 282-290: global_exists method  \n- Line 337: queue_push with empty list\n- Lines 376-385: queue_clear method\n\nThese storage operations need direct unit tests to ensure correctness.","status":"closed","priority":3,"issue_type":"task","created_at":"2026-01-04T22:15:25.982124-05:00","created_by":"rusty","updated_at":"2026-01-04T22:30:05.625934-05:00","closed_at":"2026-01-04T22:30:05.625934-05:00","close_reason":"Added comprehensive tests for FunctionStorageSqlite. Coverage improved from 83% to 98%."}

vgi/examples/scalar.py

@@ -43,7 +43,8 @@ class Meta:
         name = "double_column"
         description = "Doubles values in a numeric column"
 
-    column = Arg[str](0, doc="Column name to double")
+    # Explicit arrow_type demonstrates type specification
+    column = Arg[str](0, doc="Column name to double", arrow_type=pa.utf8())
 
     @property
     def output_type(self) -> pa.DataType:

vgi/examples/table.py

@@ -152,7 +152,10 @@ class Meta:
 
     start: int = Arg[int](0, doc="Start of range (inclusive)")  # type: ignore[assignment]
     end: int = Arg[int](1, doc="End of range (exclusive)")  # type: ignore[assignment]
-    step: int = Arg[int](2, default=1, doc="Step between values", ge=1)  # type: ignore[assignment]
+    # Explicit arrow_type to use int32 instead of inferred int64
+    step: int = Arg[int](  # type: ignore[assignment]
+        2, default=1, doc="Step between values", ge=1, arrow_type=pa.int32()
+    )
 
     BATCH_SIZE: ClassVar[int] = 1000