opt: fix PruneUnionAllCols panic with outer scope columns #160580
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Before this change, the PruneUnionAllCols normalization rule would panic in crdb-test builds when the projection above a UnionAll referenced columns from an outer scope (e.g., due to an apply-join or routine). This occurred because the rule computed the needed column set by combining ProjectionOuterCols and passthrough columns, which could include outer scope columns not present in the UnionAll's output. These outer columns were then passed to NeededColMapLeft/Right, which call TranslateColSetStrict and panic when given unknown columns. This change fixes the issue by intersecting the needed column set with the UnionAll's output columns before passing it to NeededColMapLeft/ Right. This ensures only columns actually present in the UnionAll are translated, preventing the panic. Fixes cockroachdb#159793 Release note: None Co-Authored-By: Claude <[email protected]>
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Before this change, the PruneUnionAllCols normalization rule would panic in crdb-test builds when the projection above a UnionAll referenced columns from an outer scope (e.g., due to an apply-join or routine). This occurred because the rule computed the needed column set by combining ProjectionOuterCols and passthrough columns, which could include outer scope columns not present in the UnionAll's output. These outer columns were then passed to NeededColMapLeft/Right, which call TranslateColSetStrict and panic when given unknown columns.
This change fixes the issue by intersecting the needed column set with the UnionAll's output columns before passing it to NeededColMapLeft/ Right. This ensures only columns actually present in the UnionAll are translated, preventing the panic.
Fixes #159793
Release note: None
Co-Authored-By: Claude [email protected]