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https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487509#comment-15487509
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Dan Bress commented on FLINK-3869:
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I know this is slated for 2.0, but just wanted to drop a comment saying that I
am running into an issue where this fix would be beneficial to me.
> WindowedStream.apply with FoldFunction is too restrictive
> ---------------------------------------------------------
>
> Key: FLINK-3869
> URL: https://issues.apache.org/jira/browse/FLINK-3869
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> Right now we have this signature:
> {code}
> public <R> SingleOutputStreamOperator<R> apply(R initialValue,
> FoldFunction<T, R> foldFunction, WindowFunction<R, R, K, W> function) {
> {code}
> but we should have this signature to allow users to return a type other than
> the fold accumulator type from their window function:
> {code}
> public <ACC, R> SingleOutputStreamOperator<R> apply(ACC initialValue,
> FoldFunction<T, ACC> foldFunction, WindowFunction<ACC, R, K, W> function) {
> {code}
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