[jira] [Commented] (FLINK-5720) Deprecate "Folding" in all of DataStream API

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

    [ https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112702#comment-16112702 ] 

ASF GitHub Bot commented on FLINK-5720:
---------------------------------------

Github user NicoK commented on the issue:

    https://github.com/apache/flink/pull/3816
  
    Actually, `KeyedStream.aggregate` is protected and thus not accessible.
    
    You may, however, access `WindowedStream#aggregate(AggregateFunction<T,ACC,R>) ` and `AllWindowedStream#aggregate(AggregateFunction<T,ACC,R>) ` for windowed streams and use a stateful map or flatmap for the rest.


> Deprecate "Folding" in all of DataStream API
> --------------------------------------------
>
>                 Key: FLINK-5720
>                 URL: https://issues.apache.org/jira/browse/FLINK-5720
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            Reporter: Aljoscha Krettek
>            Assignee: Chesnay Schepler
>            Priority: Blocker
>             Fix For: 1.3.0, 1.4.0
>
>
> Folding is an operation that cannot be done incrementally in a distributed way and that also cannot be done on merging windows. Now that we have {{AggregatingState}} and aggregate operations we should deprecate folding in the APIs and deprecate {{FoldingState}}.
> I suggest to remove folding completely in Flink 2.0



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