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MDEV-30066 (limit + offset) union all (...) limit = incorrect result

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select_union_direct::send_data() only sends a record when
the LIMIT ... OFFSET clause of the individual select won't skip it.

Thus, select_union_direct::send_data() should not do any actions
related to a sending a record if the offset of a select isn't
reached yet
This commit is contained in:
Sergei Golubchik 2022-11-23 00:58:07 +01:00
commit cfb47ddde2
3 changed files with 32 additions and 5 deletions
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15
mysql-test/main/union.result
View file

@ -2748,5 +2748,20 @@ a b c d
3 4 2 197
drop table t1,t2;
#
# MDEV-30066 (limit + offset) union all (...) limit = incorrect result
#
create table t1(id int primary key auto_increment, c1 int);
insert into t1(c1) values(1),(2),(3);
(select * from t1 where c1>=1 order by c1 desc limit 2,1) union all (select * from t1 where c1>1 order by c1 desc);
id c1
1 1
2 2
3 3
(select * from t1 where c1>=1 order by c1 desc limit 2,1) union all (select * from t1 where c1>1 order by c1 desc) limit 2;
id c1
1 1
2 2
drop table t1;
#
# End of 10.3 tests
#

9
mysql-test/main/union.test
View file

@ -1982,6 +1982,15 @@ union (select 0 as a, 99 as b,
drop table t1,t2;
--echo #
--echo # MDEV-30066 (limit + offset) union all (...) limit = incorrect result
--echo #
create table t1(id int primary key auto_increment, c1 int);
insert into t1(c1) values(1),(2),(3);
(select * from t1 where c1>=1 order by c1 desc limit 2,1) union all (select * from t1 where c1>1 order by c1 desc);
(select * from t1 where c1>=1 order by c1 desc limit 2,1) union all (select * from t1 where c1>1 order by c1 desc) limit 2;
drop table t1;
--echo #
--echo # End of 10.3 tests
--echo #