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drop table if exists t1,t3;
#
# MDEV-20611: MRR scan over partitioned InnoDB table produces "Out of memory" error
#
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
set @tmp=@@default_storage_engine;
set default_storage_engine=myisam;
create table t3 (
ID bigint(20) NOT NULL AUTO_INCREMENT,
part_id int,
key_col int,
col2 int,
key(key_col),
PRIMARY KEY (ID,part_id)
) PARTITION BY RANGE (part_id)
(PARTITION p1 VALUES LESS THAN (3),
PARTITION p2 VALUES LESS THAN (7),
PARTITION p3 VALUES LESS THAN (10)
);
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
`ID` bigint(20) NOT NULL AUTO_INCREMENT,
`part_id` int(11) NOT NULL,
`key_col` int(11) DEFAULT NULL,
`col2` int(11) DEFAULT NULL,
PRIMARY KEY (`ID`,`part_id`),
KEY `key_col` (`key_col`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
PARTITION BY RANGE (`part_id`)
(PARTITION `p1` VALUES LESS THAN (3) ENGINE = MyISAM,
PARTITION `p2` VALUES LESS THAN (7) ENGINE = MyISAM,
PARTITION `p3` VALUES LESS THAN (10) ENGINE = MyISAM)
set default_storage_engine= @tmp;
insert into t3 select
A.a+10*B.a,
A.a,
B.a,
123456
from t1 A, t1 B;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='mrr=on';
explain
select * from t3 force index (key_col) where key_col < 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range key_col key_col 5 NULL # Using index condition; Rowid-ordered scan
select * from t3 force index (key_col) where key_col < 3;
ID part_id key_col col2
1 0 0 123456
1 1 0 123456
2 2 0 123456
10 0 1 123456
11 1 1 123456
12 2 1 123456
20 0 2 123456
21 1 2 123456
22 2 2 123456
3 3 0 123456
4 4 0 123456
5 5 0 123456
6 6 0 123456
13 3 1 123456
14 4 1 123456
15 5 1 123456
16 6 1 123456
23 3 2 123456
24 4 2 123456
25 5 2 123456
26 6 2 123456
7 7 0 123456
8 8 0 123456
9 9 0 123456
17 7 1 123456
18 8 1 123456
19 9 1 123456
27 7 2 123456
28 8 2 123456
29 9 2 123456
set optimizer_switch=@save_optimizer_switch;
drop table t1,t3;
#
# MDEV-21544: partitioned table is joined with BKA+MRR
#
set @save_join_cache_level=@@join_cache_level;
set @save_optimizer_switch=@@optimizer_switch;
create table t0 (
tp int, a int, b int not null, c varchar(12), index idx (a,b)
);
insert into t0 values
(1,3,30,'yyzy'), (1,3,30,'yxxyy'), (1,3,30,'yyxy'), (1,3,30,'xxyy'),
(1,3,30,'yyxz'), (1,3,30,'yyzz'), (1,3,30,'xxyzy'), (1,3,30,'yyyy'),
(1,3,30,'yzzy'), (1,93,30,'zzzy'),
(2,3,40,'yxx'), (2,4,40,'xx'), (2,3,10,'zxz'),
(2,3,40,'yyx'), (2,4,40,'xxx'), (2,3,10,'zyyz'),
(2,3,40,'xzzzz'), (2,4,40,'yyyxx'), (2,3,10,'zyz'),
(2,3,40,'xxx'), (2,4,40,'xx'), (2,3,10,'zzz'),
(2,3,40,'yyxzx'), (2,4,40,'xyx'), (2,3,10,'xzz'),
(2,3,40,'xxxzz'), (2,4,40,'xxz'), (2,3,10,'zzzy'),
(2,3,40,'zzxxx'), (2,4,40,'zxx'), (2,3,10,'yzzz'),
(2,3,40,'xyyxx'), (2,4,40,'xzzzx'), (2,3,10,'zzxxz'),
(2,3,40,'yzxxx'), (2,4,40,'xxzy'), (2,3,10,'zzzyx'),
(2,93,40,'xzx'), (2,94,40,'xz'), (2,93,10,'zyyyz'),
(3,4,30,'yx'), (3,4,30,'yyxxx'), (3,4,30,'zzyy'), (3,4,30,'zxyy'),
(3,4,30,'xxyy'), (3,4,30,'yyzx'), (3,4,30,'zyyy'), (3,4,30,'yzy'),
(3,4,30,'zzzyy'), (3,94,30,'yyz');
create table t1 (
tp int, a int, b int not null, c varchar(12), index idx (a,b)
)
partition by list (tp)
( partition p1 values in (1),
partition p2 values in (2),
partition p3 values in (3));
insert into t1 select * from t0;
create table t2 (a int, index idx(a));
insert into t2 values
(1), (2), (3), (4), (5);
insert into t2 select a+10 from t2;
insert into t2 select a+20 from t2;
analyze table t0,t1,t2;
Table Op Msg_type Msg_text
test.t0 analyze status Engine-independent statistics collected
test.t0 analyze status OK
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
set join_cache_level=6;
set optimizer_switch='mrr=on';
explain extended select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = t2.a-1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 2 100.00 Using where; Using index
1 SIMPLE t0 ALL idx NULL NULL NULL 50 25.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t0`.`tp` AS `tp`,`test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t0`.`c` AS `c`,`test`.`t2`.`a` AS `a` from `test`.`t0` join `test`.`t2` where `test`.`t0`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` in (3,4) and `test`.`t0`.`b` / 10 = `test`.`t2`.`a` - 1
select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = t2.a-1;
tp a b c a
3 4 30 yx 4
3 4 30 yyxxx 4
3 4 30 zzyy 4
3 4 30 zxyy 4
3 4 30 xxyy 4
3 4 30 yyzx 4
3 4 30 zyyy 4
3 4 30 yzy 4
3 4 30 zzzyy 4
explain extended select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = t2.a-1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 2 100.00 Using where; Using index
1 SIMPLE t1 ref idx idx 5 test.t2.a 12 100.00 Using index condition(BKA); Using join buffer (flat, BKA join); Rowid-ordered scan
Warnings:
Note 1003 select `test`.`t1`.`tp` AS `tp`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` in (3,4) and `test`.`t1`.`b` / 10 = `test`.`t2`.`a` - 1
select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = t2.a-1;
tp a b c a
3 4 30 yx 4
3 4 30 yyxxx 4
3 4 30 zzyy 4
3 4 30 zxyy 4
3 4 30 xxyy 4
3 4 30 yyzx 4
3 4 30 zyyy 4
3 4 30 yzy 4
3 4 30 zzzyy 4
explain extended select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = 4;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 2 100.00 Using where; Using index
1 SIMPLE t0 ALL idx NULL NULL NULL 50 25.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t0`.`tp` AS `tp`,`test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t0`.`c` AS `c`,`test`.`t2`.`a` AS `a` from `test`.`t0` join `test`.`t2` where `test`.`t0`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` in (3,4) and `test`.`t0`.`b` / 10 = 4
select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = 4;
tp a b c a
2 3 40 yxx 3
2 4 40 xx 4
2 3 40 yyx 3
2 4 40 xxx 4
2 3 40 xzzzz 3
2 4 40 yyyxx 4
2 3 40 xxx 3
2 4 40 xx 4
2 3 40 yyxzx 3
2 4 40 xyx 4
2 3 40 xxxzz 3
2 4 40 xxz 4
2 3 40 zzxxx 3
2 4 40 zxx 4
2 3 40 xyyxx 3
2 4 40 xzzzx 4
2 3 40 yzxxx 3
2 4 40 xxzy 4
explain extended select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = 4;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 2 100.00 Using where; Using index
1 SIMPLE t1 ref idx idx 5 test.t2.a 12 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan
Warnings:
Note 1003 select `test`.`t1`.`tp` AS `tp`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` in (3,4) and `test`.`t1`.`b` / 10 = 4
select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = 4;
tp a b c a
2 3 40 yxx 3
2 4 40 xx 4
2 3 40 yyx 3
2 4 40 xxx 4
2 3 40 xzzzz 3
2 4 40 yyyxx 4
2 3 40 xxx 3
2 4 40 xx 4
2 3 40 yyxzx 3
2 4 40 xyx 4
2 3 40 xxxzz 3
2 4 40 xxz 4
2 3 40 zzxxx 3
2 4 40 zxx 4
2 3 40 xyyxx 3
2 4 40 xzzzx 4
2 3 40 yzxxx 3
2 4 40 xxzy 4
insert into t2 values
(3), (4), (5);
analyze table t2;
Table Op Msg_type Msg_text
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
explain extended select * from t2 left join t0 on t2.a=t0.a where t2.a in (3,4) and t0.b is null;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 4 100.00 Using where; Using index
1 SIMPLE t0 ref idx idx 5 test.t2.a 12 100.00 Using where; Not exists; Using join buffer (flat, BKA join); Rowid-ordered scan
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t0`.`tp` AS `tp`,`test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t0`.`c` AS `c` from `test`.`t2` left join `test`.`t0` on(`test`.`t0`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` is not null) where `test`.`t2`.`a` in (3,4) and `test`.`t0`.`b` is null
select * from t2 left join t0 on t2.a=t0.a where t2.a in (3,4) and t0.b is null;
a tp a b c
explain extended select * from t2 left join t1 on t2.a=t1.a where t2.a in (3,4) and t1.b is null;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx idx 5 NULL 4 100.00 Using where; Using index
1 SIMPLE t1 ref idx idx 5 test.t2.a 12 100.00 Using where; Not exists; Using join buffer (flat, BKA join); Rowid-ordered scan
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t1`.`tp` AS `tp`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t2` left join `test`.`t1` on(`test`.`t1`.`a` = `test`.`t2`.`a` and `test`.`t2`.`a` is not null) where `test`.`t2`.`a` in (3,4) and `test`.`t1`.`b` is null
select * from t2 left join t1 on t2.a=t1.a where t2.a in (3,4) and t1.b is null;
a tp a b c
set join_cache_level=@save_join_cache_level;
set optimizer_switch=@save_optimizer_switch;
drop table t0,t1,t2;
#
# MDEV-21628: Index condition pushdown for a simple condition over
# index fields is not used for ref access of partitioned tables when employing BKA
#
create table t0 (
tp int, a int, b int, c varchar(12), index idx (a,b)
);
insert into t0 values
(1,3,30,'yyzy'), (1,3,30,'yxxyy'), (1,3,30,'yyxy'), (1,3,30,'xxyy'),
(1,3,30,'yyxz'), (1,3,30,'yyzz'), (1,3,30,'xxyzy'), (1,3,30,'yyyy'),
(1,3,30,'yzzy'), (1,93,30,'zzzy'),
(2,3,40,'yxx'), (2,4,40,'xx'), (2,3,10,'zxz'),
(2,3,40,'yyx'), (2,4,40,'xxx'), (2,3,10,'zyyz'),
(2,3,40,'xzzzz'), (2,4,40,'yyyxx'), (2,3,10,'zyz'),
(2,3,40,'xxx'), (2,4,40,'xx'), (2,3,10,'zzz'),
(2,3,40,'yyxzx'), (2,4,40,'xyx'), (2,3,10,'xzz'),
(2,3,40,'xxxzz'), (2,4,40,'xxz'), (2,3,10,'zzzy'),
(2,3,40,'zzxxx'), (2,4,40,'zxx'), (2,3,10,'yzzz'),
(2,3,40,'xyyxx'), (2,4,40,'xzzzx'), (2,3,10,'zzxxz'),
(2,3,40,'yzxxx'), (2,4,40,'xxzy'), (2,3,10,'zzzyx'),
(2,93,40,'xzx'), (2,94,40,'xz'), (2,93,10,'zyyyz'),
(3,4,30,'yx'), (3,4,30,'yyxxx'), (3,4,30,'zzyy'), (3,4,30,'zxyy'),
(3,4,30,'xxyy'), (3,4,30,'yyzx'), (3,4,30,'zyyy'), (3,4,30,'yzy'),
(3,4,30,'zzzyy'), (3,94,30,'yyz');
create table t1 (
tp int, a int, b int, c varchar(12), index idx (a,b)
) engine=myisam
partition by list (tp)
( partition p1 values in (1),
partition p2 values in (2),
partition p3 values in (3));
insert into t1 select * from t0;
create table t2 (a int, index idx(a)) engine=myisam;
insert into t2 values (1), (2), (3), (4), (5);
insert into t2 select a+10 from t2;
insert into t2 select a+20 from t2;
analyze table t0,t1,t2;
Table Op Msg_type Msg_text
test.t0 analyze status Engine-independent statistics collected
test.t0 analyze status OK
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
set @tmp1=@@join_cache_level, @tmp2=@@optimizer_switch;
set join_cache_level=6, optimizer_switch='mrr=on';
explain
select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx idx 5 NULL 2 Using where; Using index
1 SIMPLE t0 ALL idx NULL NULL NULL 50 Using where; Using join buffer (flat, BNL join)
# This will use "Using index condition(BKA)"
explain
select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx idx 5 NULL 2 Using where; Using index
1 SIMPLE t1 ref idx idx 5 test.t2.a 12 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan
set join_cache_level=@tmp1, optimizer_switch=@tmp2;
drop table t0,t1,t2;
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