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Date: Mon, 21 Nov 2016 15:33:58 +0000 (UTC)
From: "Yassine Marzougui (JIRA)" <jira@apache.org>
To: issues@flink.apache.org
Message-ID: <JIRA.12964981.1462370644000.328873.1479742438386@Atlassian.JIRA>
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Subject: [jira] [Commented] (FLINK-3869) WindowedStream.apply with
 FoldFunction is too restrictive
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archived-at: Mon, 21 Nov 2016 15:34:00 -0000


    [ https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15683873#comment-15683873 ] 

Yassine Marzougui commented on FLINK-3869:
------------------------------------------

[~aljoscha] Yes, I could fix the Scala API en the end too.

> 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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