mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 20:42:30 +01:00
2820f30dde
The problem was caused by the following scenario:
Subquery's table has two indexes, KEY a(a), KEY a_b(a,b)
- LATERAL DERIVED optimization decides to use index a.
= The subquery uses ref access over key a.
- test_if_skip_sort_order() sees that KEY a_b satisfies the
subquery's GROUP BY clause, and attempts to switch to it.
= It fails to do so, because KEYUSE objects for index a_b
are switched off.
Fixed by disallowing to change the ref access key if it uses KEYUSE
objects injected by LATERAL DERIVED optimization.
176 lines
5.9 KiB
Text
176 lines
5.9 KiB
Text
#
|
|
# MDEV-16917: do not use splitting for derived with join cache
|
|
#
|
|
CREATE TABLE t1 (
|
|
n1 int(10) NOT NULL,
|
|
n2 int(10) NOT NULL,
|
|
c1 char(1) NOT NULL,
|
|
KEY c1 (c1),
|
|
KEY n1_c1_n2 (n1,c1,n2)
|
|
) ENGINE=InnoDB;
|
|
INSERT INTO t1 VALUES (0, 2, 'a'), (1, 3, 'a');
|
|
ANALYZE TABLE t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status OK
|
|
EXPLAIN SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
|
|
WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index c1,n1_c1_n2 n1_c1_n2 9 NULL 2 Using where; Using index
|
|
1 PRIMARY <derived2> ref key0 key0 8 test.t1.n1,test.t1.n2 2
|
|
2 LATERAL DERIVED t1 ref c1,n1_c1_n2 n1_c1_n2 4 test.t1.n1 1 Using where; Using index
|
|
SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
|
|
WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
|
|
n1
|
|
0
|
|
1
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-17211: splittable materialized derived joining 3 tables with
|
|
# GROUP BY list containing fields from 2 of them
|
|
#
|
|
CREATE TABLE t1 (
|
|
id1 int, i1 int, id2 int,
|
|
PRIMARY KEY (id1), KEY (i1), KEY (id2)
|
|
) ENGINE=InnoDB;
|
|
INSERT INTO t1 VALUES (1,1,1);
|
|
CREATE TABLE t2 (id2 int, i2 int) ENGINE=InnoDB;
|
|
INSERT INTO t2 VALUES (1, 1);
|
|
CREATE TABLE t3 (id3 int, i3 int, PRIMARY KEY (id3)) ENGINE=InnoDB;
|
|
INSERT INTO t3 VALUES (1,1);
|
|
EXPLAIN SELECT id3
|
|
FROM (SELECT t3.id3, t2.i2, t1.id2 FROM t3,t1,t2
|
|
WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
|
|
GROUP BY t3.id3, t1.id2) AS t,
|
|
t2
|
|
WHERE t2.id2=t.id2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where
|
|
1 PRIMARY <derived2> ref key0 key0 5 test.t2.id2 2
|
|
2 DERIVED t3 ALL NULL NULL NULL NULL 1 Using where; Using temporary; Using filesort
|
|
2 DERIVED t1 eq_ref PRIMARY,id2 PRIMARY 4 test.t3.i3 1
|
|
2 DERIVED t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
|
SELECT id3
|
|
FROM (SELECT t3.id3, t2.i2, t1.id2 FROM t3,t1,t2
|
|
WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
|
|
GROUP BY t3.id3, t1.id2) AS t,
|
|
t2
|
|
WHERE t2.id2=t.id2;
|
|
id3
|
|
1
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# Bug mdev-17381: equi-join of derived table with join_cache_level=4
|
|
#
|
|
CREATE TABLE t1 (
|
|
id int NOT NULL,
|
|
amount decimal DEFAULT NULL,
|
|
PRIMARY KEY (id)
|
|
) ENGINE=INNODB;
|
|
CREATE TABLE t2 (
|
|
id int NOT NULL,
|
|
name varchar(50) DEFAULT NULL,
|
|
PRIMARY KEY (id)
|
|
) ENGINE=INNODB;
|
|
INSERT INTO t1 VALUES
|
|
(1, 10.0000), (2, 20.0000), (3, 30.0000), (4, 40.0000),
|
|
(5, NULL), (6, NULL), (7, 70.0000), (8, 80.0000);
|
|
INSERT INTO t2 VALUES
|
|
(1,'A'), (2,'B'), (3,'C'), (4,'D'), (5, NULL), (6, NULL),
|
|
(7,'E'), (8,'F'), (9,'G'), (10,'H'), (11, NULL), (12, NULL);
|
|
set join_cache_level=4;
|
|
SELECT t2.id,t2.name,t.total_amt
|
|
FROM t2
|
|
LEFT JOIN
|
|
(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
|
|
ON t2.id=t.id
|
|
WHERE t2.id < 3;
|
|
id name total_amt
|
|
1 A 10
|
|
2 B 20
|
|
EXPLAIN SELECT t2.id,t2.name,t.total_amt
|
|
FROM t2
|
|
LEFT JOIN
|
|
(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
|
|
ON t2.id=t.id
|
|
WHERE t2.id < 3;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 range PRIMARY PRIMARY 4 NULL 2 Using where
|
|
1 PRIMARY <derived2> ref key0 key0 5 test.t2.id 2
|
|
2 LATERAL DERIVED t1 eq_ref PRIMARY PRIMARY 4 test.t2.id 1
|
|
set join_cache_level=default;
|
|
DROP TABLE t1,t2;
|
|
#
|
|
# Bug mdev-18467: join of grouping view and a base table as inner operand
|
|
# of left join with on condition containing impossible range
|
|
#
|
|
create table t1 (f1 int, f2 int, key(f2)) engine=InnoDB;
|
|
insert into t1 values (3,33), (7,77), (1,11);
|
|
create table t2 (f1 int, f2 int, primary key (f1)) engine=InnoDB;
|
|
insert into t2 values (3,33), (9,99), (1,11);
|
|
create view v1 as
|
|
select f1, max(f2) as f2 from t2 group by f1;
|
|
select t.f2
|
|
from t1
|
|
left join
|
|
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
|
|
on t1.f1=t.f1;
|
|
f2
|
|
NULL
|
|
NULL
|
|
NULL
|
|
explain select t.f2
|
|
from t1
|
|
left join
|
|
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
|
|
on t1.f1=t.f1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t const f2 NULL NULL NULL 1 Impossible ON condition
|
|
1 PRIMARY <derived2> const key1 NULL NULL NULL 1 Impossible ON condition
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
|
|
2 DERIVED t2 ALL PRIMARY NULL NULL NULL 3 Using temporary; Using filesort
|
|
set statement optimizer_switch='split_materialized=off' for explain select t.f2
|
|
from t1
|
|
left join
|
|
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
|
|
on t1.f1=t.f1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t const f2 NULL NULL NULL 1 Impossible ON condition
|
|
1 PRIMARY <derived2> const key1 NULL NULL NULL 1 Impossible ON condition
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
|
|
2 DERIVED t2 index NULL PRIMARY 4 NULL 3
|
|
drop view v1;
|
|
drop table t1,t2;
|
|
#
|
|
# MDEV-23723: Crash when test_if_skip_sort_order() is checked for derived table subject to split
|
|
#
|
|
CREATE TABLE t1 (a INT, b INT, KEY (a), KEY (a,b)) ENGINE=InnoDB;
|
|
CREATE TABLE t2 (c INT, KEY (c)) ENGINE=InnoDB;
|
|
SELECT * FROM t1 t1a JOIN t1 t1b;
|
|
a b a b
|
|
INSERT INTO t2 VALUES (1),(2);
|
|
INSERT INTO t1 VALUES (1,2),(3,4),(5,6),(7,8),(9,10),(11,12);
|
|
set statement optimizer_switch='split_materialized=off' for EXPLAIN
|
|
SELECT *
|
|
FROM
|
|
t1 JOIN
|
|
(SELECT t1.a, t1.b FROM t1, t2 WHERE t1.b = t2.c GROUP BY t1.a, t1.b) as dt
|
|
WHERE
|
|
t1.a = dt.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index a,a_2 a_2 10 NULL 6 Using where; Using index
|
|
1 PRIMARY <derived2> ref key0 key0 5 test.t1.a 2
|
|
2 DERIVED t1 index NULL a_2 10 NULL 6 Using where; Using index
|
|
2 DERIVED t2 ref c c 5 test.t1.b 1 Using index
|
|
set statement optimizer_switch='split_materialized=on' for EXPLAIN
|
|
SELECT *
|
|
FROM
|
|
t1 JOIN
|
|
(SELECT t1.a, t1.b FROM t1, t2 WHERE t1.b = t2.c GROUP BY t1.a, t1.b) as dt
|
|
WHERE
|
|
t1.a = dt.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index a,a_2 a_2 10 NULL 6 Using where; Using index
|
|
1 PRIMARY <derived2> ref key0 key0 5 test.t1.a 2
|
|
2 LATERAL DERIVED t1 ref a,a_2 a 5 test.t1.a 1 Using where; Using temporary; Using filesort
|
|
2 LATERAL DERIVED t2 ref c c 5 test.t1.b 1 Using index
|
|
DROP TABLE t1, t2;
|