1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
SET @save_innodb_stats_persistent=@@GLOBAL.innodb_stats_persistent;
SET GLOBAL innodb_stats_persistent = OFF;
# Create a table with a large varchar field that we index the prefix
# of and ensure we only trigger cluster lookups when we expect it.
create table prefixinno (
id int not null,
fake_id int not null,
bigfield varchar(4096),
primary key(id),
index bigfield_idx (bigfield(32)),
index fake_id_bigfield_prefix (fake_id, bigfield(32))
) engine=innodb;
insert into prefixinno values (1, 1001, repeat('a', 1)),
(8, 1008, repeat('b', 8)),
(24, 1024, repeat('c', 24)),
(31, 1031, repeat('d', 31)),
(32, 1032, repeat('x', 32)),
(33, 1033, repeat('y', 33)),
(128, 1128, repeat('z', 128));
select * from prefixinno;
id fake_id bigfield
1 1001 a
8 1008 bbbbbbbb
24 1024 cccccccccccccccccccccccc
31 1031 ddddddddddddddddddddddddddddddd
32 1032 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
33 1033 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
128 1128 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
# Eligible for optimization.
select id, bigfield from prefixinno where bigfield = repeat('d', 31);
id bigfield
31 ddddddddddddddddddddddddddddddd
# Eligible for optimization, access via fake_id only.
select id, bigfield from prefixinno where fake_id = 1031;
id bigfield
31 ddddddddddddddddddddddddddddddd
# Not eligible for optimization, access via fake_id of big row.
select id, bigfield from prefixinno where fake_id = 1033;
id bigfield
33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
# Not eligible for optimization.
select id, bigfield from prefixinno where bigfield = repeat('x', 32);
id bigfield
32 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
select id, bigfield from prefixinno where bigfield = repeat('y', 33);
id bigfield
33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
select id, bigfield from prefixinno where bigfield = repeat('b', 8);
id bigfield
8 bbbbbbbb
select id, bigfield from prefixinno where bigfield = repeat('c', 24);
id bigfield
24 cccccccccccccccccccccccc
select id, bigfield from prefixinno where bigfield = repeat('z', 128);
id bigfield
128 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
select id, bigfield from prefixinno where fake_id = 1033;
id bigfield
33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
drop table prefixinno;
# Multi-byte handling case
SET NAMES utf8mb4;
CREATE TABLE t1(
f1 varchar(10) CHARACTER SET UTF8MB4 COLLATE UTF8MB4_BIN,
INDEX (f1(3)))ENGINE=INNODB;
INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
# Eligible - record length is shorter than prefix
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
f1
a
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
f1
cccc
cčc
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
f1
až
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
f1
தமிழ்
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
f1
ggᵷg
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
f1
😊me
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
f1
ls¢
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '¢¢%';
f1
¢¢
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
f1
🐱🌑
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
f1
🌑
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
f1
🌒
DROP TABLE t1;
# Multi-byte with minimum character length > 1 bytes
CREATE TABLE t1(
f1 varchar(10) CHARACTER SET UTF16 COLLATE UTF16_BIN,
INDEX (f1(3)))ENGINE=INNODB;
INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
# Eligible - record length is shorter than prefix
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
f1
a
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
f1
cccc
cčc
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
f1
až
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
f1
தமிழ்
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
f1
ggᵷg
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
f1
😊me
# Not eligible - record length longer than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
f1
ls¢
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX(`f1`) WHERE f1 like '¢¢%';
f1
¢¢
# Eligible - record length shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
f1
🐱🌑
# Eligible - record length is shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
f1
🌑
# Eligible - record length is shorter than prefix length
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
f1
🌒
DROP TABLE t1;
CREATE TABLE t1(
col1 INT,
col2 BLOB DEFAULT NULL,
INDEX `idx1`(col2(4), col1))ENGINE=INNODB;
INSERT INTO t1 VALUES (2, 'test'), (3, repeat('test1', 2000));
INSERT INTO t1(col1) VALUES(1);
# Eligible - record length is shorter than prefix length
SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 is NULL;
col1
1
# Not eligible - record length longer than prefix index
SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 like 'test1%';
col1
3
DROP TABLE t1;
#
# MDEV-20464 Division by 0 in row_search_with_covering_prefix()
#
CREATE TABLE t1 (f1 INT, f2 INT AS (f1), f3 INT AS (f1), f4 INT AS (f1),
KEY (f1,f2,f3)) ENGINE=InnoDB;
INSERT INTO t1 (f1) VALUES (NULL),(0);
SELECT f1, MAX(f3), COUNT(f4) FROM t1 GROUP BY f1;
f1 MAX(f3) COUNT(f4)
NULL NULL 0
0 0 1
DROP TABLE t1;
#
# MDEV-23600 Division by 0 in row_search_with_covering_prefix()
#
CREATE TABLE t(c POINT UNIQUE) ENGINE=InnoDB;
INSERT t SET c=POINT(1,1);
SELECT * FROM t WHERE c > (SELECT MAX(c) FROM t);
c
DROP TABLE t;
#
# MDEV-12486 Wrong results with innodb_prefix_index_cluster_optimization
#
CREATE TABLE wp_blogs (
blog_id bigint(20) NOT NULL auto_increment,
site_id bigint(20) NOT NULL default '0',
domain varchar(200) NOT NULL default '',
path varchar(100) NOT NULL default '',
registered datetime NOT NULL default '0000-00-00 00:00:00',
last_updated datetime NOT NULL default '0000-00-00 00:00:00',
public tinyint(2) NOT NULL default '1',
archived tinyint(2) NOT NULL default '0',
mature tinyint(2) NOT NULL default '0',
spam tinyint(2) NOT NULL default '0',
deleted tinyint(2) NOT NULL default '0',
lang_id int(11) NOT NULL default '0',
PRIMARY KEY (blog_id),
KEY domain (domain(50),path(5)),
KEY lang_id (lang_id)
) ENGINE=InnoDB DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
INSERT INTO wp_blogs (domain, path) VALUES
('domain.no', '/fondsinvesteringer/'), ('domain.no', '/'),
('foo', 'bar'), ('bar', 'foo'), ('foo', 'foo'), ('bar', 'bar'),
('foo', 'foobar'), ('bar', 'foobar'), ('foobar', 'foobar');
SELECT blog_id FROM wp_blogs WHERE domain IN ('domain.no')
AND path IN ( '/fondsinvesteringer/', '/' );
blog_id
2
1
DROP TABLE wp_blogs;
SET GLOBAL innodb_stats_persistent = @save_innodb_stats_persistent;
|
