Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3327#issuecomment-63392635
LGTM. The question is whether this changes the binary or source
compatibility. I don't think it changes source compatibility since it merely
loosens a restriction. I don't think it would change the binary signature
either? but MIMA will help know for sure.
Also, I think `keyBy` has the same issue?
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