Add nested struct schema evolution support for Map types#23914

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kosiew wants to merge 10 commits into

apache:mainfrom

kosiew:map-evolution-03-20835

Commits on Jul 26, 2026

feat: enhance Map struct handling and validation
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feat: enhance cast_map_column to accept &MapArray and derive source metadata internally
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feat: enhance Map key/value handling and evolution semantics
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feat: enhance sorting behavior and key type requirements
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feat(validation): optimize target Map validation and remove redundancy
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feat(validation): enhance key struct validation to reject no-overlap structs at planner boundary
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feat(tests): add E2E negative Parquet test and refactor map fixture/schema helpers
kosiew
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feat: improve nested struct validation and enhance E2E tests
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Commits on Jul 27, 2026