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

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-5720:
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             Summary: 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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