opt: fix panic with empty column sets in set operations #150706
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Fix panic "column statistics cannot be determined for empty column set" when performing set operations (UNION, INTERSECT, EXCEPT) on tables with no columns (e.g., created with "SELECT ALL"). Relatedly, relax the "invalid union" assertion in CanConvertUnionToDistinctUnionAll that incorrectly assumed that we will never have an operation with no columns. Fixes cockroachdb#130593 Release note: None 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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Fix panic "column statistics cannot be determined for empty column set" when performing set operations (UNION, INTERSECT, EXCEPT) on tables with no columns (e.g., created with "SELECT ALL").
Relatedly, relax the "invalid union" assertion in
CanConvertUnionToDistinctUnionAll that incorrectly assumed that we will never have an operation with no columns.
Fixes #130593
Release note: None
🤖 Generated with Claude Code