Laljo John Pullokkaran created HIVE-11919:
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Summary: Hive Union Type Mismatch
Key: HIVE-11919
URL: https://issues.apache.org/jira/browse/HIVE-11919
Project: Hive
Issue Type: Bug
Reporter: Laljo John Pullokkaran
Assignee: Laljo John Pullokkaran
In Hive for union right most type wins out for most primitive types during plan
gen. However when union op gets initialized the type gets switched.
This could result in bad data & type exceptions.
This happens only in non cbo mode.
In CBO mode, Hive would add explicit type casts that would prevent such type
issues.
Sample Query:
select cd/sum(cd) over() from(select cd from u1 union all select cd from u2
union all select cd from u3)u4;
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