Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7020#issuecomment-116805887
In this case, it looks like we'll always up silently ignoring the empty
user-defined partitioner if it has zero partitions, which might lead to other
kinds of counterintuitive behavior. Is there some way to fix this in the join
itself rather than doing such a broad change to the partitioner behavior here?
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