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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15655) Optimizer: Allow config option to disable n-way JOIN merging
Date Thu, 26 Jan 2017 10:20:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839522#comment-15839522
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Lefty Leverenz commented on HIVE-15655:
---------------------------------------

Thanks for the detailed doc, Gopal.

* [hive.merge.nway.joins | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.merge.nway.joins]

> Optimizer: Allow config option to disable n-way JOIN merging 
> -------------------------------------------------------------
>
>                 Key: HIVE-15655
>                 URL: https://issues.apache.org/jira/browse/HIVE-15655
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>    Affects Versions: 2.2.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15655.1.patch, HIVE-15655.2.patch, HIVE-15655.2.patch, HIVE-15655.3.patch
>
>
> N-way Joins in Tez produce bad runtime plans whenever they are left-outer joins with
map-joins.
> This is something which should have a safety setting.



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