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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7613) Research optimization of auto convert join to map join[Spark branch]
Date Tue, 05 Aug 2014 07:55:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085956#comment-14085956
] 

Xuefu Zhang commented on HIVE-7613:
-----------------------------------

Thanks for logging this, [~chengxiang li]. This is a good area too look at. Since it's optimization,
it doesn't belong to either Milestone 1 or 2. Thus, let's give a lower priority to this one,
unless there are no tasks at a higher priority.

> 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
>
> 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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