Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/10661#issuecomment-178423933
@mwws thanks for submitting a patch on this. After thinking more about the
ticket, I think we won't need it anymore as long as we implement anti-join, and
rewrite except using that.
See SPARK-12660.
I'm going to close the ticket.
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