Naveen Gangam created HIVE-23435:
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Summary: Full outer join result is missing rows
Key: HIVE-23435
URL: https://issues.apache.org/jira/browse/HIVE-23435
Project: Hive
Issue Type: Bug
Components: HiveServer2
Affects Versions: 3.1.0
Reporter: Naveen Gangam
Assignee: Jesus Camacho Rodriguez
Full Outer join result has missing rows. Appears to be a bug with the full
outer join logic. Expected output is receiving when we do a left and right
outer join.
Reproducible steps are mentioned below.
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SUPPORT ANALYSIS
Steps to Reproduce:
1. Create a table and insert data:
create table x (z char(5), x int, y int);
insert into x values ('one', 1, 50),
('two', 2, 30),
('three', 3, 30),
('four', 4, 60),
('five', 5, 70),
('six', 6, 80);
2. Try full outer with the below command. The result is incomplete, it is
missing the row:
NULL NULL NULL three 3 30.0
Full Outer Join:
select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
x2.`x`, x2.`y`
from `x` x1 full outer join
`x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
x2.`x`);
Result:
----------------------------------+
x1.z x1.x x1.y x2.z x2.x x2.y
----------------------------------+
one 1 50 NULL NULL NULL
NULL NULL NULL one 1 50
two 2 30 NULL NULL NULL
NULL NULL NULL two 2 30
three 3 30 NULL NULL NULL
four 4 60 NULL NULL NULL
NULL NULL NULL four 4 60
five 5 70 NULL NULL NULL
NULL NULL NULL five 5 70
six 6 80 NULL NULL NULL
NULL NULL NULL six 6 80
----------------------------------+
3. Expected output is coming when we use left/right join + union:
select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
x2.`x`, x2.`y`
from `x` x1 left outer join
`x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
x2.`x`)
union
select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
x2.`x`, x2.`y`
from `x` x1 right outer join
`x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
x2.`x`);
Result:
------------------------------------+
z x y _col3 _col4 _col5
------------------------------------+
NULL NULL NULL five 5 70
NULL NULL NULL four 4 60
NULL NULL NULL one 1 50
four 4 60 NULL NULL NULL
one 1 50 NULL NULL NULL
six 6 80 NULL NULL NULL
three 3 30 NULL NULL NULL
two 2 30 NULL NULL NULL
NULL NULL NULL six 6 80
NULL NULL NULL three 3 30
NULL NULL NULL two 2 30
five 5 70 NULL NULL NULL
------------------------------------+
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EXPECTED ENGINEERING ACTION
Confirm this is a bug. If so, any work around or just use left+right outer join.
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