branch-4.0: [fix](set operation) Use regular child output for set operation rules #64908#65070
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branch-4.0: [fix](set operation) Use regular child output for set operation rules #64908#65070github-actions[bot] wants to merge 1 commit into
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…#64908) ### What problem does this PR solve? Related PR: #24060, #27628 Problem Summary: Some Nereids rewrite rules mapped set operation outputs to child outputs by list index. Set operations can carry regulator child outputs whose order and cardinality differ from the child plan output, so those rules could read past the child output or rewrite expressions with the wrong child slot. This change makes one-row union merge and distinct TopN/Limit pushdown build child mappings from regular child outputs instead. ### Release note Fix planner failures or incorrect set operation rewrites when regulated child outputs differ from child plan outputs.
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Cherry-picked from #64908