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https://issues.apache.org/jira/browse/SPARK-2215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038497#comment-14038497
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Reynold Xin commented on SPARK-2215:
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I personally find multiway join operator extremely complicated and am not sure
if it is the best idea. In Shark we implemented it, but I think there are only
2 people in this world that understand that code ...
> 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
>
> Support the multi-way join (multiple table joins) in a single reduce stage if
> they has the same join key.
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