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From "Vikram Dixit K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13343) Need to disable hybrid grace hash join in llap mode except for dynamically partitioned hash join
Date Mon, 09 May 2016 19:57:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276909#comment-15276909
] 

Vikram Dixit K commented on HIVE-13343:
---------------------------------------

It looks like many of the diffs are about slightly varying explain plans. I don't believe
they are because of my changes.

{code}
-                    COLUMN_STATS_ACCURATE {"COLUMN_STATS":{"key":"true","value":"true"},"BASIC_STATS":"true"}
+                    COLUMN_STATS_ACCURATE {"BASIC_STATS":"true","COLUMN_STATS":{"key":"true","value":"true"}}
{code}

> Need to disable hybrid grace hash join in llap mode except for dynamically partitioned
hash join
> ------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-13343
>                 URL: https://issues.apache.org/jira/browse/HIVE-13343
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>    Affects Versions: 2.1.0
>            Reporter: Vikram Dixit K
>            Assignee: Vikram Dixit K
>         Attachments: HIVE-13343.1.patch, HIVE-13343.2.patch, HIVE-13343.3.patch, HIVE-13343.4.patch,
HIVE-13343.5.patch
>
>
> Due to performance reasons, we should disable use of hybrid grace hash join in llap when
dynamic partition hash join is not used. With dynamic partition hash join, we need hybrid
grace hash join due to the possibility of skews.



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