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https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160619#comment-16160619
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ASF GitHub Bot commented on FLINK-5720:
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Github user iduanyingjie commented on the issue:
https://github.com/apache/flink/pull/3816
In this document
[https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/stream/operators/index.html#datastream-transformations](url)
`keyedStream.fold("start")((str, i) => { str + "-" + i })`
I want to do the same thing, what am I supposed to do and and don't use
deprecated API
> 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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