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https://issues.apache.org/jira/browse/SPARK-22152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16196053#comment-16196053
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Apache Spark commented on SPARK-22152:
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User 'sohum2002' has created a pull request for this issue:
https://github.com/apache/spark/pull/19454
> 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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