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From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16947) Semijoin Reduction : Task cycle created due to multiple semijoins in conjunction with hashjoin
Date Fri, 23 Jun 2017 03:15:00 GMT

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

Deepak Jaiswal updated HIVE-16947:
----------------------------------
    Attachment: HIVE-16947.1.patch

Initial patch

> 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
>
>
> 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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