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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318972#comment-15318972 ] 

ASF GitHub Bot commented on FLINK-3869:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/1973
  
    I think the API breaking changes preventer will reject this.
    It is all public methods, and the signature changes (implicit parameters and context bounds are parameters in the bytecode)


> 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: 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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