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Posted to issues@spark.apache.org by "Allison Wang (Jira)" <ji...@apache.org> on 2022/10/12 19:13:00 UTC

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

Allison Wang created SPARK-40773:
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             Summary: 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


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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