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https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15683857#comment-15683857
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Aljoscha Krettek commented on FLINK-3869:
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[~ymarzougui] Did it work out in the end for the Scala API? In the PR I see
that you also add the methods for the Scala API (I haven't checked out the code
yet)
[~sjwiesman] Is the PR more or less what you also have in your version?
> WindowedStream.apply with FoldFunction is too restrictive
> ---------------------------------------------------------
>
> Key: FLINK-3869
> URL: https://issues.apache.org/jira/browse/FLINK-3869
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Yassine Marzougui
>
> 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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