Github user tianyi commented on the pull request:
https://github.com/apache/spark/pull/3362#issuecomment-63749734
@chenghao-intel ï¼you are right , the `broadcast outer join` could only
works for "LeftOuterJoin with right table broadcasted" and "RightOuterJoin with
left table broadcasted". For other cases, spark should still use
`HashOuterJoin`. The `BroadcastHashOuterJoin` is not replacing `HashOuterJoin`,
just a optimization for particular cases.
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