fix: add missing nulls_not_distinct property to IndexStmt transformer

[pyramation]

fix: add missing nulls_not_distinct property to IndexStmt transformer

Summary

Fixed a transformer issue where CREATE INDEX statements with NULLS NOT DISTINCT clause were failing in the PostgreSQL v15-to-v16 transformer. The IndexStmt transformer was missing the nulls_not_distinct property handling, causing test cases like create_index-72.sql to be skipped.

Changes:

• Added nulls_not_distinct property handling to the IndexStmt transformer in v15-to-v16.ts
• Enabled 4 previously skipped CREATE INDEX test cases by commenting out their entries in transformer-errors.ts
• All 267 transformer tests now pass, confirming no regressions

Review & Testing Checklist for Human

Risk Level: 🟡 Medium - Simple change following established patterns, but limited validation of SQL syntax and type definitions

• Verify type definitions: Check that nulls_not_distinct property exists in both PG15 and PG16 IndexStmt type definitions in the schema files
• Test actual SQL syntax: Examine one of the previously failing SQL files (e.g., latest/postgres/create_index-72.sql) to understand the exact CREATE INDEX syntax being transformed
• Run focused test: Test just one of the previously failing cases in isolation to verify the transformation works correctly
• Check for other missing properties: Compare the IndexStmt transformer with similar transformers (like Constraint) to see if other properties are missing
• End-to-end verification: Create a test script with CREATE UNIQUE INDEX idx ON tbl (col) NULLS NOT DISTINCT syntax and verify it transforms correctly

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    subgraph "Transform Package"
        V15ToV16["packages/transform/src/transformers/v15-to-v16.ts"]:::major-edit
        Errors["packages/transform/test-utils/skip-tests/transformer-errors.ts"]:::minor-edit
        Tests["packages/transform/__tests__/kitchen-sink/15-16/latest-postgres-create_index.test.ts"]:::context
    end
    
    subgraph "SQL Test Files"
        SQL72["latest/postgres/create_index-72.sql"]:::context
        SQL83["latest/postgres/create_index-83.sql"]:::context
        SQL85["latest/postgres/create_index-85.sql"]:::context
        SQL184["latest/postgres/create_index-184.sql"]:::context
    end
    
    V15ToV16 -->|"transforms"| SQL72
    V15ToV16 -->|"transforms"| SQL83
    V15ToV16 -->|"transforms"| SQL85
    V15ToV16 -->|"transforms"| SQL184
    
    Tests -->|"runs"| SQL72
    Tests -->|"runs"| SQL83
    Tests -->|"runs"| SQL85
    Tests -->|"runs"| SQL184
    
    Errors -->|"controls skipping"| Tests
    
    subgraph Legend
        L1["Major Edit"]:::major-edit (green)
        L2["Minor Edit"]:::minor-edit (blue)
        L3["Context/No Edit"]:::context (white)
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB
    classDef context fill:#FFFFFF

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Notes

• The fix follows the exact same pattern used in the Constraint transformer where nulls_not_distinct is already properly handled
• CREATE INDEX with NULLS NOT DISTINCT is a PostgreSQL feature for unique indexes that treats NULL values as distinct from each other
• This was requested by Dan Lynch (pyramation@gmail.com) in Devin session: https://app.devin.ai/sessions/648fc5d6fb81492ab99b6e870f13ad3b
• All 267 v15-to-v16 transformer tests pass after this change, indicating no regressions

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