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Posted to issues@flink.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2015/03/02 12:13:04 UTC

[jira] [Commented] (FLINK-1622) Add ReducePartial and GroupReducePartial Operators

    [ https://issues.apache.org/jira/browse/FLINK-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14343041#comment-14343041 ] 

Aljoscha Krettek commented on FLINK-1622:
-----------------------------------------

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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