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https://issues.apache.org/jira/browse/FLINK-1140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163208#comment-14163208
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Aljoscha Krettek commented on FLINK-1140:
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We already have this in the Scala API.
> Add a flatmap that returns an Iterable instead of aggregation to a collector
> -----------------------------------------------------------------------------
>
> Key: FLINK-1140
> URL: https://issues.apache.org/jira/browse/FLINK-1140
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API, Streaming
> Affects Versions: 0.8-incubating
> Reporter: Márton Balassi
> Assignee: Márton Balassi
>
> This would enable more concise lambda function usage like the flatmap here:
> flatMap(sentence -> Arrays.asList(sentence.split(" ")))
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