Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/872#issuecomment-116649358
In the batch API, equality of the partitioners is used to determine
compatibility of the partitioning. This may at some point become interesting
for the streaming API as well.
In any case, let's pick one of the two variants (function of partitioner
implementation). Overloading the methods too much with equally powerful
variants inevitable confuses users.
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