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Posted to issues@hive.apache.org by "Deepak Jaiswal (JIRA)" <ji...@apache.org> on 2017/02/05 04:53:41 UTC

[jira] [Commented] (HIVE-15808) Remove semijoin reduction branch if it is on bigtable along with hash join

    [ https://issues.apache.org/jira/browse/HIVE-15808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853113#comment-15853113 ] 

Deepak Jaiswal commented on HIVE-15808:
---------------------------------------

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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