Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/872#issuecomment-115832961
Wouldn't it make sense to implement custom partitioning in a way that it
allows to return a array of indexes like in the ChannelSelector interface?
Returning only 1 index limits the partitioning very much.
Maybe the users could implement a ChannelSelector and we would wrap that.
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