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https://issues.apache.org/jira/browse/SPARK-33177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-33177.
----------------------------------
    Fix Version/s: 3.1.0
       Resolution: Fixed

Issue resolved by pull request 30087
[https://github.com/apache/spark/pull/30087]

> CollectList and CollectSet should not be nullable
> -------------------------------------------------
>
>                 Key: SPARK-33177
>                 URL: https://issues.apache.org/jira/browse/SPARK-33177
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Tanel Kiis
>            Assignee: Tanel Kiis
>            Priority: Minor
>             Fix For: 3.1.0
>
>
> CollectList and CollectSet SQL expressions never return null value. Marking 
> them as non-nullable can have some performance benefits, because some 
> optimizer rules apply only to non-nullable expressions



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