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https://issues.apache.org/jira/browse/SPARK-23821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li updated SPARK-23821:
----------------------------
    Issue Type: Sub-task  (was: New Feature)
        Parent: SPARK-23899

> Collection function: flatten
> ----------------------------
>
>                 Key: SPARK-23821
>                 URL: https://issues.apache.org/jira/browse/SPARK-23821
>             Project: Spark
>          Issue Type: Sub-task
>          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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