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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2017/01/18 09:52:26 UTC

[jira] [Updated] (HIVE-15655) Optimizer: Allow config option to disable n-way JOIN merging

     [ https://issues.apache.org/jira/browse/HIVE-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated HIVE-15655:
---------------------------
    Status: Patch Available  (was: Open)

> 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
>         Attachments: HIVE-15655.1.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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