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