Github user maropu commented on the issue:
https://github.com/apache/spark/pull/22364
Can we replace the syntax(`(ouputSetA -- outputSetB).nonEmpty`) in other
places, too? e.g.,
https://github.com/apache/spark/blob/9deddbb13edebfefb3fd03f063679ed12e73c575/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala#L294
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