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https://issues.apache.org/jira/browse/HIVE-16947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16062175#comment-16062175
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Deepak Jaiswal edited comment on HIVE-16947 at 6/25/17 12:35 AM:
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With the changes, the query78 would get in task cycle without the fix..
was (Author: djaiswal):
With the changes, the query78 would get in task cycle.
> Semijoin Reduction : Task cycle created due to multiple semijoins in
> conjunction with hashjoin
> ----------------------------------------------------------------------------------------------
>
> Key: HIVE-16947
> URL: https://issues.apache.org/jira/browse/HIVE-16947
> Project: Hive
> Issue Type: Bug
> Reporter: Deepak Jaiswal
> Assignee: Deepak Jaiswal
> Attachments: HIVE-16947.1.patch, HIVE-16947.2.patch
>
>
> Typically a semijoin branch and a mapjoin may create a cycle when on same
> operator tree. This is already handled, however, a semijoin branch can serve
> more than one filters and the cycle detection logic currently only handles
> the 1st one causing cycles preventing the queries from running.
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