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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1622) Add GroupReducePartial Operator
Date Tue, 10 Mar 2015 17:18:38 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355233#comment-14355233

ASF GitHub Bot commented on FLINK-1622:

Github user aljoscha commented on the pull request:

    Sorry, I completely blanked, of course, You still need the grouping, only the shuffle
step you don't need.
    So, I suggest only better tests, using a combination of partitionByHash() and groupReducePartial().

> Add GroupReducePartial Operator
> -------------------------------
>                 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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