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https://issues.apache.org/jira/browse/HIVE-15808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852232#comment-15852232
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Deepak Jaiswal commented on HIVE-15808:
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Posted a review at,
https://reviews.apache.org/r/56294/
> Remove Semijoin reduction branch on reducers if there is 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.patch
>
>
> It is found that the current logic of cycle detection does not find cycles
> created when there is a semijoin branch parallel to a hash join on a reducer.
> To avoid such cycles, remove the semijoin reduction optimization.
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