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https://issues.apache.org/jira/browse/FLINK-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15676772#comment-15676772
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Fabian Hueske commented on FLINK-5094:
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Yes, the incremental aggregation functions are part of the state objects. I'm
not familiar with the details, just notice that {{RichFunction.open()}} is not
called. [~aljoscha] knows this part better than I do.
> Support RichReduceFunction and RichFoldFunction as incremental window
> aggregation functions
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-5094
> URL: https://issues.apache.org/jira/browse/FLINK-5094
> Project: Flink
> Issue Type: Improvement
> Components: Streaming, Windowing Operators
> Affects Versions: 1.2.0, 1.1.3
> Reporter: Fabian Hueske
>
> Support {{RichReduceFunction}} and {{RichFoldFunction}} as incremental window
> aggregation functions in order to initialize the functions via {{open()}}.
> The main problem is that we do not want to provide the full power of
> {{RichFunction}} for incremental aggregation functions, such as defining own
> operator state. This could be achieve by providing some kind of
> {{RestrictedRuntimeContext}}.
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