Na Yang created HIVE-7767:
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Summary: hive.optimize.union.remove does not work properly [Spark
Branch]
Key: HIVE-7767
URL: https://issues.apache.org/jira/browse/HIVE-7767
Project: Hive
Issue Type: Bug
Reporter: Na Yang
Assignee: Na Yang
Turing on the hive.optimize.union.remove property generates wrong union all
result.
For Example:
create table inputTbl1(key string, val string) stored as textfile;
load data local inpath '../../data/files/T1.txt' into table inputTbl1;
SELECT *
FROM (
SELECT key, count(1) as values from inputTbl1 group by key
UNION ALL
SELECT key, count(1) as values from inputTbl1 group by key
) a;
when the hive.optimize.union.remove is turned on, the query result is like:
1 1
2 1
3 1
7 1
8 2
when the hive.optimize.union.remove is turned off, the query result is like:
7 1
2 1
8 2
3 1
1 1
7 1
2 1
8 2
3 1
1 1
The expected query result is:
7 1
2 1
8 2
3 1
1 1
7 1
2 1
8 2
3 1
1 1
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