Github user gaborhermann commented on the pull request:
https://github.com/apache/flink/pull/872#issuecomment-116647912
By the way, in the Scala DataSet the user should specify the Java
`Partitioner[K]` class. Wouldn't it be more convenient to wrap a function like
`(K, Int) => Int` into a `Partitioner[K]` similarly to the KeySelector?
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