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https://issues.apache.org/jira/browse/SPARK-36702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-36702:
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Assignee: Apache Spark
> array_union should not produce duplicated result
> ------------------------------------------------
>
> Key: SPARK-36702
> URL: https://issues.apache.org/jira/browse/SPARK-36702
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Wenchen Fan
> Assignee: Apache Spark
> 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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