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https://issues.apache.org/jira/browse/FLINK-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora resolved FLINK-2405.
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Resolution: Implemented
> Add stateful transformations using lambdas to the Streaming Scala API
> ---------------------------------------------------------------------
>
> Key: FLINK-2405
> URL: https://issues.apache.org/jira/browse/FLINK-2405
> Project: Flink
> Issue Type: New Feature
> Components: Scala API, Streaming
> Reporter: Gyula Fora
> Assignee: Gyula Fora
> Priority: Minor
>
> I propose to extend the Streaming Scala API methods (map, flatmap, filter
> etc) with versions that take stateful functions as lambdas. This would allow
> for a nice functional way of defining stateful transformations:
> Example:
> def mapWithState( fun: (I, Option[S]) => (O, Option[S]), stateByKey: Boolean
> = false)
> The stateByKey optional flag allows the user to partition the state by key
> when applied on a KeyedDataStream.
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