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From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15808) Remove semijoin reduction branch if it is on bigtable along with hash join
Date Sun, 05 Feb 2017 04:53:41 GMT

    [ 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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