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https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112702#comment-16112702
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ASF GitHub Bot commented on FLINK-5720:
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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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