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https://issues.apache.org/jira/browse/SPARK-22152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183764#comment-16183764
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Sean Owen commented on SPARK-22152:
-----------------------------------
Likewise for RDDs. It's not a bad idea, but it also adds little. Not sure if
it's worth an API change.
> Add Dataset flatten function
> ----------------------------
>
> Key: SPARK-22152
> URL: https://issues.apache.org/jira/browse/SPARK-22152
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Drew Robb
> Priority: Minor
>
> Currently you can use an identify flatMap to flatten a Dataset, for example
> to get from a Dataset[Option[T]] to a Dataset[T], but adding flatten directly
> would allow for a more similar API to scala collections.
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