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https://issues.apache.org/jira/browse/HIVE-15721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837311#comment-15837311
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Ashutosh Chauhan commented on HIVE-15721:
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[~vgarg] Can you create a RB request for it?
> Allow IN/NOT IN correlated subquery with aggregates
> ----------------------------------------------------
>
> Key: HIVE-15721
> URL: https://issues.apache.org/jira/browse/HIVE-15721
> Project: Hive
> Issue Type: Sub-task
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Labels: sub-query
> Attachments: HIVE-15721.1.patch
>
>
> With HIVE-15544 IN/NOT IN correlated subqueries with aggregates were disabled
> since re-writting them into JOIN could have produced wrong result.
> Wrong results would occur if subquery produces zero row, since aggregate
> always produce result lower such query into LEFT JOIN or SEMI JOIN would not
> take these case into consideration.
> We propose to allow such queries with an added run time check which will
> throw an error/exception if subquery produces zero row.
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