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https://issues.apache.org/jira/browse/SPARK-2215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054491#comment-14054491
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Yin Huai commented on SPARK-2215:
---------------------------------
Instead of implementing a multi-way join operator, how about we just rely on
AddExchange to properly insert Exchange Operator to avoid unnecessary data
movements?
> 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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