Type:
Bug
Priority:
Major
Resolution:
Fixed
Affects Version/s:
5.1.67 , 5.2.14 , 5.3.12 , 10.1.13 , 5.5(EOL) , 10.0(EOL) , 10.1(EOL) , 10.2(EOL)
Please consider the following scenario:
drop table if exists union_bug;
create table union_bug (d datetime not null primary key );
insert into union_bug(d) values ( '2016-06-01' ),( '2016-06-02' ),( '2016-06-03' ),( '2016-06-04' );
select * from
(
select * from union_bug where d between '2016-06-02' and '2016-06-05'
union
( select * from union_bug where d < '2016-06-05' order by d desc limit 1)
) onlyJun2toJun4
order by d
The above query should return 3 rows dated 02 through 04 June 2016. This can be born out by running the individual select statements.
However in practice this query returns 4 rows incorrectly dated 01 through 04 June 2016. It should NEVER NEVER NEVER return a row for 01 June, but it does.
I suspect this may be somehow related to the duplicate row from the lower query. If I change the 'union to a 'union all' then the query correctly returns the expected 4 rows, including the one duplicate row.
relates to
MDEV-7805
Wrong result (extra rows) with UNION and LIMIT in the union parts
Closed
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