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https://issues.apache.org/jira/browse/FLINK-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14343041#comment-14343041
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Aljoscha Krettek commented on FLINK-1622:
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Scratch that, ReducePartial is not required since we can always have a combiner
in that case since Reduce must return the input type...
> Add ReducePartial and GroupReducePartial Operators
> --------------------------------------------------
>
> Key: FLINK-1622
> URL: https://issues.apache.org/jira/browse/FLINK-1622
> Project: Flink
> Issue Type: Sub-task
> Affects Versions: 0.9
> Reporter: Aljoscha Krettek
>
> This does what a Reduce or GroupReduce Operator does, except it is only
> performed on a local partition.
> This is also similar to an explicit combine that can output a type that is
> different from the input.
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