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https://issues.apache.org/jira/browse/FLINK-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276122#comment-15276122
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ASF GitHub Bot commented on FLINK-3869:
---------------------------------------
GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/1973
[FLINK-3869] Relax window fold generic parameters
Before, the WindowFunction in a fold/apply could not emit a type that
was different from the accumulator type of the fold. This restriction is
unnecessary.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aljoscha/flink window-fold-relax
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1973.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1973
----
commit 0e0d9b79b770d9708935920014314e4021e9751e
Author: Aljoscha Krettek <[email protected]>
Date: 2016-05-05T06:34:44Z
[FLINK-3869] Relax window fold generic parameters
Before, the WindowFunction in a fold/apply could not emit a type that
was different from the accumulator type of the fold. This restriction is
unnecessary.
----
> 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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