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

["Jan-Erik Hedbom (JIRA)" <ji...@apache.org>]

Jan-Erik Hedbom created HIVE-12941:
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             Summary: 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


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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