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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