Fix struct casts to align fields by name (prevent positional mis-casts)#19674

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kosiew wants to merge 11 commits intoapache:mainfrom

kosiew:struct-casting-17285

Commits on Dec 30, 2025

Refactor struct casting and add unit tests
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docs: Document struct field-by-name casting behavior in ColumnarValue::cast_to
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fix: Use Arc::clone instead of .clone() for ref-counted pointer
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fix: Support struct casting with field reordering and count changes
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fix: Remove unused import of Fields in columnar_value.rs
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Fix final struct test case - use float format for coerced int field
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fix: Add name-based struct coercion for CASE expressions and struct type comparison
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fix: Enable struct casting with field count changes by skipping const-folding
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fix: Enable struct coercion TODO tests in case.slt
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refactor: Consolidate struct casting logic into nested_struct module
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Commits on Jan 7, 2026

Add #17285 reproducer case
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