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https://issues.apache.org/jira/browse/FLINK-3899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15411590#comment-15411590
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Aljoscha Krettek commented on FLINK-3899:
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Yes, I thing that would be enough.

> Document window processing with Reduce/FoldFunction + WindowFunction
> --------------------------------------------------------------------
>
>                 Key: FLINK-3899
>                 URL: https://issues.apache.org/jira/browse/FLINK-3899
>             Project: Flink
>          Issue Type: Improvement
>          Components: Documentation, Streaming
>    Affects Versions: 1.1.0
>            Reporter: Fabian Hueske
>
> The streaming documentation does not describe how windows can be processed 
> with FoldFunction or ReduceFunction and a subsequent WindowFunction. This 
> combination allows for eager window aggregation (only a single element is 
> kept in the window) and access of the Window object, e.g., to have access to 
> the window's start and end time.



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