Github user massie commented on the pull request:
https://github.com/apache/spark/pull/7403#issuecomment-121686068
@JoshRosen @rxin I just pushed an update that reverts the
`PairRDDFunctions` `ClassTag` implicits to their original form.
The only remaining sticking point is the three `combineByKey` methods in
`PairRDDFunctions` which require a `ClassTag` in order to get type information
about the combiner class. Does adding an implicit to a method break binary
compatibility? (I'm certain that removing an implicit would)
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