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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7613) Research optimization of auto convert join to map join[Spark branch]
Date Mon, 18 Aug 2014 23:01:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101475#comment-14101475
] 

Brock Noland commented on HIVE-7613:
------------------------------------

Note that MapJoin is a stretch goal of M1 and a specific goal of M2.

> Research optimization of auto convert join to map join[Spark branch]
> --------------------------------------------------------------------
>
>                 Key: HIVE-7613
>                 URL: https://issues.apache.org/jira/browse/HIVE-7613
>             Project: Hive
>          Issue Type: Task
>          Components: Spark
>            Reporter: Chengxiang Li
>            Priority: Minor
>
> ConvertJoinMapJoin is an optimization the replaces a common join(aka shuffle join) with
a map join(aka broadcast or fragment replicate join) when possible. we need to research how
to make it workable with Hive on Spark.



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