Enforce explicit opt-in for `WITHIN GROUP` syntax in aggregate UDAFs#18607

Merged

Jefffrey merged 28 commits intoapache:mainfrom

kosiew:within-group-18109

Nov 14, 2025

Commits on Nov 11, 2025

feat: enforce WITHIN GROUP support for ordered-set aggregate functions in planner
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feat: add documentation for WITHIN GROUP support in ordered-set aggregates
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feat: enforce restrictions on WITHIN GROUP support for order-insensitive aggregates
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Enforce WITHIN GROUP clause for ordered-set UDAFs
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feat: add test case for rejection of WITHIN GROUP in non-ordered-set UDAFs
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feat: update test case for WITHIN GROUP rejection in non-ordered-set UDAFs and enhance upgrade documentation for stricter planner enforcement
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feat: add rejection test for WITHIN GROUP clause in non-ordered-set UDAFs and remove obsolete test file
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feat: add error handling for WITHIN GROUP clause in array_agg function for non-ordered-set aggregates
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Improve error handling in within_group_udaf functions
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feat: update test case for percentile_cont UDAF to use c3 ordering in WITHIN GROUP clause
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feat: add test for named argument behavior with WITHIN GROUP in percentile_cont UDAF
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refactor: clean up imports and remove redundant use statements in sql_integration tests
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Refactor planner and improve readability
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refactor: introduce type alias WithinGroupExtraction to simplify return types and improve readability
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clippy fix
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