Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/10162
I would not bake this logic into the logical operator, I think the general
approach of doing it in Dataset is better. I just think that we need to do it
in a way that does not change existing join functionality at all. It would be
helpful to survey other systems and describe their APIs and make a proposal
based on that.
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