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https://issues.apache.org/jira/browse/SPARK-2215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038513#comment-14038513
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Cheng Hao commented on SPARK-2215:
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The multi-way join implementation in Shark is quite complicated, but we have
real case to show this can improve the join performance incredibly. I can start
working the prototype for it soon.
> Multi-way join
> --------------
>
> Key: SPARK-2215
> URL: https://issues.apache.org/jira/browse/SPARK-2215
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
> Priority: Minor
>
> Support the multi-way join (multiple table joins) in a single reduce stage if
> they have the same join keys.
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