Github user fhueske commented on the pull request:
https://github.com/apache/incubator-flink/pull/20#issuecomment-46186920
I think it is good to have the initial value for the all ReduceFunction and
grouped ReduceFunction, but not for the GroupReduceFunction. In the
GroupReduceFunction (the one with the iterator) it can be specified in the UDF.
There is no need to ingest a value into the iterator.
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