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https://issues.apache.org/jira/browse/FLINK-14275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940775#comment-16940775
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Jark Wu commented on FLINK-14275:
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It's not easy to support RichFunction for window aggregate function. As an
alternative, we had some discussions to support a restrict RichFunction for
window aggregate function before. See the relative links.
Besides, I removed the 'fix version', unless someone is committing to fix this.
> Window Aggregate function support a RichFunction
> ------------------------------------------------
>
> Key: FLINK-14275
> URL: https://issues.apache.org/jira/browse/FLINK-14275
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.9.0
> Reporter: hailong wang
> Priority: Major
>
> Now, window aggregate function cannot be a RichFunction. In other words, open
> function can not be invoked and runtimeContext cannot be fetched in
> RichAggregateFunction.
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