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manual merge 10.1->10.2

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This commit is contained in:
Andrei Elkin
2019-11-11 16:03:43 +02:00
parent 142442d571 13db50fc03
commit 26fd880d5e
10 changed files with 281 additions and 5 deletions
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56
mysql-test/r/selectivity_innodb.result
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@ -1825,6 +1825,62 @@ b a a b
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set optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
drop table t1,t2,t3;
#
# MDEV-20519: Query plan regression with optimizer_use_condition_selectivity=4
#
create table t1 (id int, a int, PRIMARY KEY(id), key(a));
insert into t1 select seq,seq from seq_1_to_100;
create table t2 (id int, a int, b int, PRIMARY KEY(id), key(a), key(b));
insert into t2 select seq,seq,seq from seq_1_to_100;
set optimizer_switch='exists_to_in=off';
set optimizer_use_condition_selectivity=2;
SELECT * FROM t1
WHERE
EXISTS (SELECT * FROM t1 A INNER JOIN t2 ON t2.a = A.id
WHERE A.a=t1.a AND t2.b < 20);
id a
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explain SELECT * FROM t1
WHERE
EXISTS (SELECT * FROM t1 A INNER JOIN t2 ON t2.a = A.id
WHERE A.a=t1.a AND t2.b < 20);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 100 Using where; Using index
2 DEPENDENT SUBQUERY A ref PRIMARY,a a 5 test.t1.a 1 Using index
2 DEPENDENT SUBQUERY t2 ref a,b a 5 test.A.id 1 Using where
EXPLAIN SELECT * FROM t1 A, t1 B WHERE A.a = B.a and A.id = 65;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE A const PRIMARY,a PRIMARY 4 const 1
1 SIMPLE B ref a a 5 const 1 Using index
explain SELECT * FROM t1
WHERE
EXISTS (SELECT * FROM t1 A INNER JOIN t2 ON t2.a = A.id
WHERE A.a=t1.a AND t2.b < 20);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 100 Using where; Using index
2 DEPENDENT SUBQUERY A ref PRIMARY,a a 5 test.t1.a 1 Using index
2 DEPENDENT SUBQUERY t2 ref a,b a 5 test.A.id 1 Using where
set optimizer_switch= @save_optimizer_switch;
set optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
drop table t1,t2;
# End of 10.1 tests
set @@global.histogram_size=@save_histogram_size;
set optimizer_switch=@save_optimizer_switch_for_selectivity_test;