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https://issues.apache.org/jira/browse/FLINK-1509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123577#comment-15123577
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Jeyhun Karimov commented on FLINK-1509:
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I will give a try to this problem
> Streaming Group Reduce Combiner
> -------------------------------
>
> Key: FLINK-1509
> URL: https://issues.apache.org/jira/browse/FLINK-1509
> Project: Flink
> Issue Type: New Feature
> Components: Local Runtime, Optimizer
> Reporter: Fabian Hueske
> Priority: Minor
>
> Combiners for GroupReduce operators are currently always (partially) sorting
> their input even if the data is already appropriately sorted.
> It should be relatively easy to add chained and unchained implementations of
> a streaming group reduce combiner strategy .
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