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https://issues.apache.org/jira/browse/SPARK-23923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431009#comment-16431009
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Kazuaki Ishizaki commented on SPARK-23923:
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I am working for this.

> High-order function: cardinality(x) → bigint
> --------------------------------------------
>
>                 Key: SPARK-23923
>                 URL: https://issues.apache.org/jira/browse/SPARK-23923
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Priority: Major
>
> Ref: https://prestodb.io/docs/current/functions/array.html and  
> https://prestodb.io/docs/current/functions/map.html.
> Returns the cardinality (size) of the array/map x.



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