Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1190#issuecomment-47176944
I'm not sure what the point of this change is. It is only serving to make
the planner more brittle and tied to the specifics of the current
implementation of the optimizer.
If the current pattern for hash joins is correct and more general, I think
we should keep it.
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