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https://issues.apache.org/jira/browse/SPARK-23821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419426#comment-16419426
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Apache Spark commented on SPARK-23821:
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User 'mn-mikke' has created a pull request for this issue:
https://github.com/apache/spark/pull/20938
> Collection functions: flatten
> -----------------------------
>
> Key: SPARK-23821
> URL: https://issues.apache.org/jira/browse/SPARK-23821
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Marek Novotny
> Priority: Major
>
> Add the flatten function that transforms an Array of Arrays column into an
> Array elements column. if the array structure contains more than two levels
> of nesting, the function removes one nesting level
> Example:
> {{flatten(array(array(1, 2, 3), array(3, 4, 5), array(6, 7, 8)) =>
> [1,2,3,4,5,6,7,8,9]}}
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