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Posted to issues@hive.apache.org by "Deepak Jaiswal (JIRA)" <ji...@apache.org> on 2017/06/23 03:14:00 UTC

[jira] [Work started] (HIVE-16947) Semijoin Reduction : Task cycle created due to multiple semijoins in conjunction with hashjoin

     [ https://issues.apache.org/jira/browse/HIVE-16947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-16947 started by Deepak Jaiswal.
---------------------------------------------
> 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
>
> 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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