Github user uce commented on the pull request:
https://github.com/apache/incubator-flink/pull/20#issuecomment-46177838
No, the idea was to provide it to the grouped one as well (I think I've
enumerated all reduce variants in the initial issue description). But I'm
unsure if it makes much sense to have an initial value per group. I guess that
should be the discussion point. ;-)
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