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https://issues.apache.org/jira/browse/SPARK-30008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kent Yao updated SPARK-30008:
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Issue Type: Bug (was: Improvement)
> the dataType of collect_list and collect_set aggregate functions should be
> ArrayType(_, false)
> ----------------------------------------------------------------------------------------------
>
> Key: SPARK-30008
> URL: https://issues.apache.org/jira/browse/SPARK-30008
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.4
> Reporter: Kent Yao
> Priority: Major
>
> {code:java}
> // Do not allow null values. We follow the semantics of Hive's
> collect_list/collect_set here.
> // See: org.apache.hadoop.hive.ql.udf.generic.GenericUDAFMkCollectionEvaluator
> {code}
> These two functions do not allow null values as they are defined, so their
> elements should not contain null.
> Casting collect_list(a) to ArrayType(_, false) will fail.
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