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https://issues.apache.org/jira/browse/HIVE-15279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15702502#comment-15702502
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Gunther Hagleitner commented on HIVE-15279:
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+1 fix is certainly valid, but also raises other questions: We do not try to
initialize any dummy ops that the merge work might have as far as I can tell. I
don't see any specific reason why mapjoins shouldn't be allowed in merge work.
Do you know why [~sershe]?
> map join dummy operators are not set up correctly in certain cases with merge
> join
> ----------------------------------------------------------------------------------
>
> Key: HIVE-15279
> URL: https://issues.apache.org/jira/browse/HIVE-15279
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15279.patch
>
>
> As a result, MapJoin is not initialized and there's NPE later.
> Tez-specific.
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