Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1562#issuecomment-191683975
Okay, that sounds like a design flaw in hiding the aggregating functions
completely from the window operator in the state. I think the operator should
be aware of the additional function, if only to open()/close() it.
The fact that a RichReduceFunction cannot be used at all seems like a huge
limitation.
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