Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/3266
@fhueske @twalthr In this PRï¼I In order to code reuse
"DataSetSessionWindowAggregatePreProcessor" has implemented the
"MapPartitionFunction" and "GroupCombineFunction" two interfaces, I'm not sure
if it's correctï¼ what do you think?
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