Add sqllogictest coverage for unused UNNEST pruning edge cases#22074

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kosiew wants to merge 2 commits intoapache:mainfrom

kosiew:unnested-pruned-01-20118

Commits on May 8, 2026

feat(tests): add new test cases for UNNEST behavior under GROUP BY and cardinality issues
kosiew
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feat(tests): clarify comments in unnest test regarding empty/null handling and cardinality contract
kosiew
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