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https://issues.apache.org/jira/browse/SPARK-18872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840098#comment-15840098
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Apache Spark commented on SPARK-18872:
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User 'dilipbiswal' has created a pull request for this issue:
https://github.com/apache/spark/pull/16710
> New test cases for EXISTS subquery
> ----------------------------------
>
> Key: SPARK-18872
> URL: https://issues.apache.org/jira/browse/SPARK-18872
> Project: Spark
> Issue Type: Sub-task
> Components: SQL, Tests
> Reporter: Nattavut Sutyanyong
>
> This JIRA is for submitting a PR for new EXISTS/NOT EXISTS subquery test
> cases. It follows the same idea as the IN subquery test cases which contain
> simple patterns, then build more complex constructs in both parent and
> subquery sides. This batch of test cases are mostly, if not all, positive
> test cases that do not return any syntax errors or unsupported functionality.
> We make effort to have test cases returning rows in the result set so that
> they can indirectly detect incorrect result problems.
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