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MDEV-18701: Wrong result from query that uses INTERSECT after UNION ALL

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Recalculate distinct pointer if we cut chain of SELECTs
This commit is contained in:
Oleksandr Byelkin
2019-03-11 17:10:20 +01:00
parent 58f3ff7175
commit 6d68a3464e
5 changed files with 69 additions and 13 deletions
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27
mysql-test/main/intersect.test
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@ -321,3 +321,30 @@ select * from t13 union select * from t234 intersect select * from t12;
drop table t12,t13,t234;
--echo # End of 10.3 tests
--echo #
--echo # MDEV-18701: Wrong result from query that uses INTERSECT after UNION ALL
--echo #
create table t1 (a int);
insert into t1 values (3), (1), (7), (3), (2), (7), (4);
create table t2 (a int);
insert into t2 values (4), (5), (9), (1), (8), (9);
create table t3 (a int);
insert into t3 values (8), (1), (8), (2), (3), (7), (2);
select * from t1 where a > 4
union all
select * from t2 where a < 5
intersect
select * from t3 where a < 5;
explain extended
select * from t1 where a > 4
union all
select * from t2 where a < 5
intersect
select * from t3 where a < 5;
drop table t1,t2,t3;