Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/7336#issuecomment-121168951
@scwf Could you please help verifying whether the HiveQL CLUSTER BY clause
helps in your scenario? Essentially what CLUSTER BY does is just adding an
`Exchange` operator, similar to the changes you made in this PR. Sorry that I
didn't think of this earlier.
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