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https://issues.apache.org/jira/browse/FLINK-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15683869#comment-15683869
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Aljoscha Krettek commented on FLINK-5094:
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I think this could work by just passing in a reference to the {{RichFunction}}.
If I'm correct then Java Serialization should keep object trees as they are so
the handle to the function that we have in the {{StateDescriptor}} and the
handle in the {{WindowOperator}} should be the same instance after
deserialising. We would then just need to make sure to call open on the
{{RichFunction}} in {{WindowOperator}}.
> 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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