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https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854009#comment-15854009
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Stephan Ewen commented on FLINK-5720:
-------------------------------------
+1
I think fold causes a lot of problems internally and blocks many optimizations
for size of state and performance.
The {{AggregateFunction}} should be able to subsume all the {{fold()}} use
cases.
> 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
>
> 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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