[jira] [Commented] (SPARK-40773) Refactor checkCorrelationsInSubquery

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-40773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616661#comment-17616661 ] 

Apache Spark commented on SPARK-40773:
--------------------------------------

User 'allisonwang-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/38226

> Refactor checkCorrelationsInSubquery
> ------------------------------------
>
>                 Key: SPARK-40773
>                 URL: https://issues.apache.org/jira/browse/SPARK-40773
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Allison Wang
>            Priority: Major
>
> Currently, the logic in `checkCorrelationsInSubquery` is inefficient and difficult to understand. It uses `foreachUp` to traverse the subquery plan tree, and traverses down an entire subtree of a plan node to check whether it contains any outer references. We can use recursion instead to traverse the plan tree only once.



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