[jira] [Assigned] (SPARK-30008) the dataType of collect_list and collect_set aggregate functions should be ArrayType(_, false)

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-30008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun reassigned SPARK-30008:
-------------------------------------

    Assignee: Kent Yao

> 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
>            Assignee: 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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