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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23821) Collection functions: flatten
Date Thu, 29 Mar 2018 17:21:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419426#comment-16419426
] 

Apache Spark commented on SPARK-23821:
--------------------------------------

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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