[jira] [Created] (HIVE-12384) Union Operator may produce incorrect result on TEZ

["Laljo John Pullokkaran (JIRA)" <ji...@apache.org>]

Laljo John Pullokkaran created HIVE-12384:
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             Summary: Union Operator may produce incorrect result on TEZ
                 Key: HIVE-12384
                 URL: https://issues.apache.org/jira/browse/HIVE-12384
             Project: Hive
          Issue Type: Bug
          Components: Hive
    Affects Versions: 0.14.0
            Reporter: Laljo John Pullokkaran
            Assignee: Laljo John Pullokkaran


Union queries may produce incorrect result on TEZ.
TEZ removes union op, thus might loose the implicit cast in union op.

Reproduction test case:
set hive.cbo.enable=false;
set hive.execution.engine=tez;
select (x/sum(x) over())  as y from(select cast(1 as decimal(10,0))  as x from (select * from src limit 2)s1 union all select cast(1 as decimal(10,0)) x from (select * from src limit 2) s2 union all select '100000000' x from (select * from src limit 2) s3)u order by y;

select (x/sum(x) over()) as y from(select cast(1 as decimal(10,0))  as x from (select * from src limit 2)s1 union all select cast(1 as decimal(10,0)) x from (select * from src limit 2) s2 union all select cast (null as string) x from (select * from src limit 2) s3)u order by y;



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