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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8911) Enable mapjoin hints [Spark Branch]
Date Fri, 29 May 2015 08:25:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564408#comment-14564408
] 

Lefty Leverenz commented on HIVE-8911:
--------------------------------------

Adding TODOC15 (which means TODOC1.1.0).

> Enable mapjoin hints [Spark Branch]
> -----------------------------------
>
>                 Key: HIVE-8911
>                 URL: https://issues.apache.org/jira/browse/HIVE-8911
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Szehon Ho
>            Assignee: Chao Sun
>              Labels: TODOC-SPARK, TODOC15
>             Fix For: 1.1.0
>
>         Attachments: HIVE-8911.1-spark.patch, HIVE-8911.2-spark.patch, HIVE-8911.3-spark.patch,
HIVE-8911.4-spark.patch, HIVE-8911.5-spark.patch, HIVE-8911.6-spark.patch
>
>
> Currently the big table selection in a mapjoin is based on stats.
> We should also enable the big-table selection based on hints.  See class MapJoinProcessor.
 This is a logical-optimizer class, so we should be able to re-use this without too many changes
to hook up with SparkMapJoinResolver.



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