Github user mateiz commented on the pull request: https://github.com/apache/spark/pull/550#issuecomment-41454793 Ah, wow, I never knew that. So if one takes a Partitioner first and one takes a function, the types are inferred, but if both take a function first, they're not? In that case we *might* want to change our other methods too, like cogroup and groupByKey, to take a Partitioner first. Wouldn't this problem also affect them?
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