Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1585#issuecomment-179835764
Hi @chiwanpark, thanks for picking up this issue and filling this gap in
the DataSet API.
Would be nice, if it could make it into the 1.0 release, IMO.
However, the implementation needs to be improved. I suggest to have a look
at the `PartitionOperator` and check how `KeySelector`s are handled there.
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