Aihua Xu created HIVE-14251:
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Summary: Union All of different types resolves to incorrect data
Key: HIVE-14251
URL: https://issues.apache.org/jira/browse/HIVE-14251
Project: Hive
Issue Type: Bug
Components: Query Planning
Reporter: Aihua Xu
Assignee: Aihua Xu
create table src(c1 date, c2 int, c3 double);
insert into src values ('2016-01-01',5,1.25);
select * from
(select c1 from src union all
select c2 from src union all
select c3 from src) t;
It will return NULL for the c1 values. Seems the common data type is resolved
to the last c3 which is double.
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