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Merge branch '10.3' into 10.4

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This commit is contained in:
Sergei Golubchik
2023-01-10 21:04:17 +01:00
parent 6cb84346e1 56948ee54c
commit fdcfc25127
38 changed files with 524 additions and 116 deletions
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52
mysql-test/main/join_nested.result
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@ -1999,3 +1999,55 @@ Note 1003 select `test`.`t3`.`pk` AS `pk`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`
DROP TABLE t1,t2,t3;
set join_cache_level= @save_join_cache_level;
set optimizer_switch=@save_optimizer_switch;
#
# MDEV-27624: Nested left joins with not_exists optimization
# for most inner left join
#
set @save_join_cache_level= @@join_cache_level;
CREATE TABLE t1 (a INT NOT NULL, b INT, c INT);
INSERT INTO t1 VALUES (1,1,1), (1,2,1), (1,3,1);
CREATE TABLE t2(a INT NOT NULL);
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3(a INT not null, b INT);
INSERT INTO t3 VALUES (1, 1), (2, 1), (3, 1);
set join_cache_level = 0;
EXPLAIN SELECT *
FROM t1
LEFT JOIN
( t2 LEFT JOIN t3 ON t2.a = t3.b )
ON t2.a = 1 AND (t3.b = t1.a AND t3.a > t1.b OR t3.a is NULL)
WHERE t1.c = 1 AND t3.a is NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where; Not exists
SELECT *
FROM t1
LEFT JOIN
( t2 LEFT JOIN t3 ON t2.a = t3.b )
ON t2.a = 1 AND (t3.b = t1.a AND t3.a > t1.b OR t3.a is NULL)
WHERE t1.c = 1 AND t3.a is NULL;
a b c a a b
1 3 1 NULL NULL NULL
set join_cache_level = 2;
EXPLAIN SELECT *
FROM t1
LEFT JOIN
( t2 LEFT JOIN t3 ON t2.a = t3.b )
ON t2.a = 1 AND (t3.b = t1.a AND t3.a > t1.b OR t3.a is NULL)
WHERE t1.c = 1 AND t3.a is NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where; Not exists; Using join buffer (incremental, BNL join)
SELECT *
FROM t1
LEFT JOIN
( t2 LEFT JOIN t3 ON t2.a = t3.b )
ON t2.a = 1 AND (t3.b = t1.a AND t3.a > t1.b OR t3.a is NULL)
WHERE t1.c = 1 AND t3.a is NULL;
a b c a a b
1 3 1 NULL NULL NULL
DROP TABLE t1, t2, t3;
set join_cache_level= @save_join_cache_level;
# end of 10.3 tests