Github user gaborhermann commented on the pull request:
https://github.com/apache/flink/pull/872#issuecomment-116736041
Sorry for not making myself clear.
I would actually go for
4. Only the Scala function (both in the streaming and batch API)
I don't understand how changing from partitioner implementation to function
implementation in the batch API would mess up determining the compatibility of
the partitioning. By compatibility I mean the type of the key must be the same
as the input of the partitioner.
I suppose there was another reason (that I do not understand) for choosing
the partitioner implementation for the Scala batch API, so if (4) is not an
option, I would go for (2) (only partitioner, sync with batch API).
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