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https://issues.apache.org/jira/browse/FLINK-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291714#comment-14291714
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Fabian Hueske commented on FLINK-1450:
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I believe this is equivalent (or very similar) to the Reduce operator of the
batch API (not to be confused with the GroupReduce operator).
If that's the case, we should call it Reduce to use equivalent terms for batch
and streaming.
> Add Fold operator to the Streaming api
> --------------------------------------
>
> Key: FLINK-1450
> URL: https://issues.apache.org/jira/browse/FLINK-1450
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Affects Versions: 0.9
> Reporter: Gyula Fora
> Priority: Minor
> Labels: starter
>
> The streaming API currently doesn't support a fold operator.
> This operator would work as the foldLeft method in Scala. This would allow
> effective implementations in a lot of cases where a the simple reduce is
> inappropriate due to different return types.
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