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