[Go][Parquet] Refactor: extract visitListLike helper for list-like types - #586
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Extract common logic for LIST, MAP, and FIXED_SIZE_LIST into a shared visitListLike helper function. This ensures nullableInParent is always set correctly before visiting child values, making it impossible to forget this step when adding new list-like type handling. The defLevelOffset parameter allows each type to specify how defLevelIfEmpty should be calculated relative to maxDefLevel after all increments. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Summary
visitListLikehelper functionnullableInParentis always set correctly before visiting child values, making it impossible to forget this step when adding new list-like type handlingdefLevelOffsetparameter to calculatedefLevelIfEmptyafter all incrementsRationale
This refactoring follows the principle of "making invalid states unrepresentable". The original bug in #584 (fixed in #585) was caused by the FIXED_SIZE_LIST case forgetting to set
nullableInParent. By extracting the common pattern into a helper function, future additions of list-like types cannot omit this critical step.Test plan
TestFixedSizeListNullableElements) continues to pass🤖 Generated with Claude Code