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https://issues.apache.org/jira/browse/SPARK-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629328#comment-15629328
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Nattavut Sutyanyong commented on SPARK-13417:
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I'd like to share that there is a JIRA SPARK-17348 opened to track an incorrect
result problem in subquery transformation. Subquery run-time processing is not
(yet) supported in Spark today. The current implementation transforms subquery
constructs into some forms of join operations in Analyzer. There are cases (as
described in SPARK-17348) that the transform alters the original meaning of the
subquery and gives incorrect result.
We may consider this JIRA resolved/closed for the implementation in 2.0 and
treat the problem as a follow-up work in a separate JIRA.
> SQL subquery support
> --------------------
>
> Key: SPARK-13417
> URL: https://issues.apache.org/jira/browse/SPARK-13417
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Reporter: Reynold Xin
>
> This is an umbrella JIRA ticket to track various issues related to subqueries.
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