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https://issues.apache.org/jira/browse/SPARK-36702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415309#comment-17415309
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Apache Spark commented on SPARK-36702:
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User 'AngersZhuuuu' has created a pull request for this issue:
https://github.com/apache/spark/pull/34003
> array_union should not produce duplicated result
> ------------------------------------------------
>
> Key: SPARK-36702
> URL: https://issues.apache.org/jira/browse/SPARK-36702
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Wenchen Fan
> Priority: Major
>
> {code:java}
> select array_union(array(cast('nan' as double), cast('nan' as double)),
> array())
> {code}
> This returns [NaN, NaN], but it should return [NaN]
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