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https://issues.apache.org/jira/browse/SPARK-23914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16564227#comment-16564227
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Apache Spark commented on SPARK-23914:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/21937
> High-order function: array_union(x, y) → array
> ----------------------------------------------
>
> Key: SPARK-23914
> URL: https://issues.apache.org/jira/browse/SPARK-23914
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Kazuaki Ishizaki
> Priority: Major
> Fix For: 2.4.0
>
>
> Ref: https://prestodb.io/docs/current/functions/array.html
> Returns an array of the elements in the union of x and y, without duplicates.
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