Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3173#issuecomment-62306671
That's really nice to have the Sort-Merge-Join, as we did meet some of join
queries couldn't run completely in real cases.
One high level comment on this, can we also keep the `ShuffleHashJoin`? It
still can be faster than the Sort-Merge-Join in some cases, all we need is a
configuration/strategy to map to different Join Operators.
BTW: do you have any performance comparison result can be shared with us?
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