Add DDL compilation tests for ARRAY, MAP, and STRUCT types

[laughingman7743]

Summary

Add comprehensive DDL compilation tests for complex data types (ARRAY, MAP, STRUCT) in SQLAlchemy integration.

This PR addresses the gap in testing DDL compilation for complex types by adding dedicated test functions that verify the correct SQL generation for table creation with these types.

Changes

New Test Functions

• test_create_table_with_array_types: Tests ARRAY type DDL compilation

  • Basic arrays: ARRAY<STRING>, ARRAY<INTEGER>
  • Nested arrays: ARRAY<ARRAY<STRING>>
  • Struct arrays: ARRAY<ROW(name STRING, age INTEGER)>

• test_create_table_with_map_types: Tests MAP type DDL compilation

  • Basic maps: MAP<STRING,STRING>, MAP<STRING,INTEGER>
  • Complex maps: MAP<STRING,ROW(...)>
  • Nested maps: MAP<STRING,ARRAY<STRING>>

• test_create_table_with_struct_types: Tests STRUCT/ROW type DDL compilation

  • Basic structs: ROW(name STRING, age INTEGER, email STRING)
  • Nested structs: ROW(personal ROW(...), preferences MAP<...>)
  • Structs with arrays: ROW(tags ARRAY<STRING>, scores ARRAY<INTEGER>)

• test_create_table_with_complex_nested_types: Tests deeply nested combinations

  • Complex nesting: ARRAY<MAP<STRING,ROW(value STRING, metadata MAP<STRING,STRING>, tags ARRAY<STRING>)>>

Implementation Details

• Uses proper Athena SQL syntax with ROW(...) format for STRUCT types
• Tests compilation using SQLAlchemy's CreateTable DDL with PyAthena dialect
• Verifies correct type string generation in compiled DDL
• Follows existing test patterns in test_base.py
• Includes comprehensive coverage of type combinations

Test Coverage

• ✅ ARRAY types (basic, nested, with complex elements)
• ✅ MAP types (basic, with complex values)
• ✅ STRUCT/ROW types (basic, nested, with collections)
• ✅ Complex nested combinations of all three types

Test Plan

• All tests pass locally with correct DDL compilation
• Code quality checks pass (lint, format, type check)
• CI validation of DDL compilation tests
• Integration test with actual table creation (if applicable)

This complements the existing runtime type conversion tests by ensuring the DDL generation works correctly for complex type definitions.

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