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https://issues.apache.org/jira/browse/HIVE-15808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853113#comment-15853113
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Deepak Jaiswal commented on HIVE-15808:
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Patch updated.
> Remove semijoin reduction branch if it is on bigtable along with hash join
> --------------------------------------------------------------------------
>
> Key: HIVE-15808
> URL: https://issues.apache.org/jira/browse/HIVE-15808
> Project: Hive
> Issue Type: Bug
> Reporter: Deepak Jaiswal
> Assignee: Deepak Jaiswal
> Attachments: HIVE-15808.2.patch, HIVE-15808.patch
>
>
> If there is a semijoin branch on the same operator pipeline which contains a
> hash join then it is by design on big table which is not optimal. The
> operator cycle detection logic may not find a cycle as there is no cycle at
> operator level. However, once Tez builds its task there can be a cycle at
> task level causing the query to fail.
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