[jira] [Assigned] (HIVE-12941) Unexpected result when using MIN() on struct with NULL in first field

["Yongzhi Chen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-12941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yongzhi Chen reassigned HIVE-12941:
-----------------------------------

    Assignee: Yongzhi Chen

> Unexpected result when using MIN() on struct with NULL in first field
> ---------------------------------------------------------------------
>
>                 Key: HIVE-12941
>                 URL: https://issues.apache.org/jira/browse/HIVE-12941
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.1.0
>            Reporter: Jan-Erik Hedbom
>            Assignee: Yongzhi Chen
>
> Using MIN() on struct with NULL in first field of a row yields NULL as result.
> Example:
> select min(a) FROM (select 1 as a union all select 2 as a union all select cast(null as int) as a) tmp;
> OK
> _c0
> 1
> As expected. But if we wrap it in a struct:
> select min(a) FROM (select named_struct("field",1) as a union all select named_struct("field",2) as a union all select named_struct("field",cast(null as int)) as a) tmp;
> OK
> _c0
> NULL
> Using MAX() works as expected for structs.



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