Zoltan Haindrich created HIVE-25822:
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Summary: Unexpected result rows in case of outer join contains
conditions only affecting one side
Key: HIVE-25822
URL: https://issues.apache.org/jira/browse/HIVE-25822
Project: Hive
Issue Type: Improvement
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
needed
* outer join
* on condition has at least one condition for one side of the join
* in a single reducer:
** a right hand side only row outputted right before
** >=2 rows on LHS and 1 on RHS matching in the join keys but the first LHS
doesn't satisfies the filter condition
** second LHS row with good filter condition
{code}
with
t_y as (select col1 as id,col2 as s from (VALUES(0,'a'),(1,'y')) as c),
t_xy as (select col1 as id,col2 as s from (VALUES(1,'x'),(1,'y')) as c)
select * from t_xy l full outer join t_y r on (l.id=r.id and l.s='y');
{code}
null,null,1,y is an unexpected result
{code}
+-------+-------+-------+-------+
| l.id | l.s | r.id | r.s |
+-------+-------+-------+-------+
| NULL | NULL | 0 | a |
| 1 | x | NULL | NULL |
| NULL | NULL | 1 | y |
| 1 | y | 1 | y |
+-------+-------+-------+-------+
{code}
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