Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8652#issuecomment-148305296
@yhuai, after some investigation, I think the we still can optimize the
left/right/full outer join in broadcasting way if they don't have condition,
but LeftSemi are not included, and it should be a bug in previous
implementation. And I also add more unit test by comparing with Hive.
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