Preserve recursive CTE nullability across logical and physical planning#22037

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kosiew wants to merge 25 commits into

apache:mainfrom

kosiew:nullability-mismatch-22034

Commits on May 13, 2026

Revert to 739e1471b: Add reusable plan-time schema alignment helper and apply to RecursiveQueryExec (#21912)
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Merge branch 'main' into nullability-mismatch-22034
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feat: add SLT repro for recursive CTE and update nullability handling
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feat: refactor recursive query handling and nullability management
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fix: update explain_tree.slt to reflect correct type casting in projection
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fix: correct SUM(0) -> 0 as level in recursive CTE query
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feat: update reconcile_recursive_query_input_nullability to handle only nullability widening
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feat: implement central recursive CTE schema helpers
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fix: update type casting in projection for explain_analyze test
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feat: update TreeNode::exists usage and optimize CTE handling
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