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Posted to reviews@spark.apache.org by "ahshahid (via GitHub)" <gi...@apache.org> on 2025/08/13 02:11:40 UTC

[PR] [SPARK-53264][SQL][CATALYST]. Incorrect nullability when correlated scalar subquery ge… [spark]

ahshahid opened a new pull request, #52003:
URL: https://github.com/apache/spark/pull/52003

   …ts converted into LeftOuterJoin
   
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   ### What changes were proposed in this pull request?
   When a scalar correlated subquery is converted into a Left Outer Join, the Project created on top of the Join,  should have nullability as true, for the attribute reference coming from the right side table.
   
   
   ### Why are the changes needed?
   This has the potential for Optimizer eventually converting the Left Outer Join to incorrectly convert it into Inner Join.
   So far the bug has remain hidden, to an unintended inefficiency in the PushDownPredicates rule. If that inefficiency is handled ( please look at the issue [SPARK-36786](https://issues.apache.org/jira/browse/SPARK-36786)
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   Added bug test
   
   
   ### Was this patch authored or co-authored using generative AI tooling?
   No
   


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Re: [PR] [SPARK-53264][SQL][CATALYST]. Incorrect nullability when correlated scalar subquery ge… [spark]

Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #52003:
URL: https://github.com/apache/spark/pull/52003#issuecomment-3565094147

   We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
   If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!


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Re: [PR] [SPARK-53264][SQL][CATALYST]. Incorrect nullability when correlated scalar subquery ge… [spark]

Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed pull request #52003: [SPARK-53264][SQL][CATALYST]. Incorrect nullability when correlated scalar subquery ge…
URL: https://github.com/apache/spark/pull/52003


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