Github user lincoln-lil commented on the issue:
https://github.com/apache/flink/pull/3141
Hi, wuchong, thanks for your review. I'll switch the pr based on 1.2.0.
I think it's not necessary doing validation repeatedly both in
DataSetJoinRule.java and operators.scala, and there already being several
validations in DataSetJoin.translateToPlan function, why don't we put the same
validation together to reduce code?
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