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https://issues.apache.org/jira/browse/HIVE-21007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710754#comment-16710754
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Vineet Garg commented on HIVE-21007:
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[~jcamachorodriguez] Review link is at https://reviews.apache.org/r/69515/
I still need to address check-style violations.
> Semi join + Union can lead to wrong plans
> -----------------------------------------
>
> Key: HIVE-21007
> URL: https://issues.apache.org/jira/browse/HIVE-21007
> Project: Hive
> Issue Type: Bug
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-21007.1.patch, HIVE-21007.2.patch
>
>
> Tez compiler has the ability to push JOIN within UNION (by replicating join
> on each branch). If this JOIN had a SJ branch outgoing (or incoming) it could
> mess up the plan and end up generating incorrect or wrong plan.
> As a safe measure any SJ branch after UNION should be removed (until we
> improve the logic to better handle SJ branches)
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