Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/21049 @mgaido91 This is a common rule. Last year, @dilipbiswal @ioana-delaney @nsyca and I had a discussion about this. We forgot to continue the efforts after finishing the first stage of the correlated subquery. https://issues.apache.org/jira/browse/SPARK-18455. @henryr Thank you for contributing to this! @dilipbiswal Do you have the bandwidth to review this PR?
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