[jira] [Commented] (FLINK-3869) WindowedStream.apply with FoldFunction is too restrictive

["Dan Bress (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487509#comment-15487509 ] 

Dan Bress commented on FLINK-3869:
----------------------------------

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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