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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
|
--source include/have_sequence.inc
--source include/have_innodb.inc
# This test is slow on buildbot.
--source include/big_test.inc
create table t1(c1 integer not null,c2 integer not null, key (c1))
ENGINE=InnoDB STATS_PERSISTENT=1;
create view v1 as select * from t1 where c1 in (0,1);
insert t1 select 0,seq from seq_1_to_500;
insert t1 select 1,seq from seq_1_to_100;
insert t1 select 2,seq from seq_1_to_50;
insert t1 select 3,seq from seq_1_to_20;
analyze table t1;
--echo #
--echo # Delete with limit (quick select - range acces)
--echo #
--disable_view_protocol
start transaction;
--enable_info
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
--disable_info
select count(*) from v1 where c1=0;
rollback;
--echo #
--echo # Delete
--echo #
start transaction;
--enable_info ONCE
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 ;
rollback;
--echo #
--echo # Delete with exists
--echo #
start transaction;
select count(*) from v1 where c1=2;
--enable_info
delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
--disable_info
select count(*) from v1 where c1=2;
rollback;
--echo #
--echo # Delete through a view with limit (range access)
--echo #
start transaction;
explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
--enable_info
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
--disable_info
select count(*) from v1 where c1=0;
rollback;
--echo #
--echo # Delete through a view (ALL access)
--echo #
start transaction;
--replace_column 9 #
explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500;
--enable_info ONCE
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 ;
select count(*) from v1 where c1=0;
rollback;
--echo #
--echo # Delete failed due to trigger
--echo #
delimiter /;
create trigger trg after delete on t1 for each row
begin
declare c int;
begin
if old.c1 = 1 then
select count(*) into c from t1 where c1!=old.c1;
SIGNAL SQLSTATE '45000' set table_name=c;
end if;
end;
end;
/
delimiter ;/
start transaction;
--error ER_SIGNAL_EXCEPTION
delete from t1 where c1=1 and (select count(*) from t1 b where b.c1=t1.c1) > 0 order by c2 asc limit 10;
rollback;
start transaction;
--error ER_SIGNAL_EXCEPTION
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) > 0 order by c1 desc limit 100;
select c1,count(*) from t1 group by c1;
rollback;
drop trigger trg;
--echo #
--echo # Delete through a view with returning
--echo #
start transaction;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 order by c2 asc limit 10 returning c1,c2;
rollback;
start transaction;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 order by c2 desc limit 10 returning c1,c2;
rollback;
--enable_view_protocol
drop view v1;
drop table t1;
--echo #
--echo # Delete from table with more than 150000 rows
--echo #
create table t1(c1 integer not null,c2 integer not null, key (c1));
insert t1 select 0,seq from seq_1_to_128000;
insert t1 select 1,seq from seq_1_to_25600;
select count(*) from t1;
--echo # with a lot of memory for sort_buffer_size
set session sort_buffer_size = 1024000;
--enable_info ONCE
delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);
--echo # with little memory for sort_buffer_size
insert t1 select 0,seq from seq_1_to_128000;
set session sort_buffer_size = 1024;
--enable_info ONCE
delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);
drop table t1;
--echo #
--echo # MDEV-17954: multi-table DELETE with the same source and target
--echo #
create table t1 (c1 int, c2 int, c3 int);
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
--echo #
--echo # Single-table DELETE with the same source and target
--echo # handled as multi-table DELETE
--echo #
let $q1=
delete from t1
where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1 and a.c2 < 3);
eval explain $q1;
eval $q1;
select * from t1;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
eval prepare stmt from "$q1";
execute stmt;
select * from t1;
delete from t1;
insert into t1 values
(2,2,5), (2,3,6), (2,4,7), (2,5,8);
execute stmt;
select * from t1;
deallocate prepare stmt;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
--echo #
--echo # Multi-table DELETE with the same source and target
--echo #
create table t2 (c1 int, c2 int, c3 int);
insert into t2 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,8);
let $q2=
delete from t1 using t1,t2
where t1.c2 = t2.c2 and t1.c1 > 1;
eval explain $q2;
eval $q2;
select * from t1;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
eval prepare stmt from "$q2";
execute stmt;
select * from t1;
delete from t1;
insert into t1 values
(2,2,5), (2,3,6), (2,4,7), (2,5,8);
execute stmt;
select * from t1;
deallocate prepare stmt;
let $q2=
delete from t1 using t1,t2
where t1.c2 = t2.c2 and t1.c1 > 1;
eval explain $q2;
eval $q2;
select * from t1;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
eval prepare stmt from "$q2";
execute stmt;
select * from t1;
delete from t1;
insert into t1 values
(2,2,5), (2,3,6), (2,4,7), (2,5,8);
execute stmt;
select * from t1;
deallocate prepare stmt;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
let $q3=
delete from t1,t2 using t1,t2
where t1.c2 = t2.c2 and t1.c1 > 1 and t2.c1 > 1;
eval explain $q3;
eval $q3;
select * from t1;
select * from t2;
delete from t1;
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
delete from t2;
insert into t2 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,8);
eval prepare stmt from "$q3";
execute stmt;
select * from t1;
select * from t2;
delete from t1;
insert into t1 values
(1,2,2), (1,3,3), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
delete from t2;
insert into t2 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5);
execute stmt;
select * from t1;
select * from t2;
deallocate prepare stmt;
drop table t1,t2;
--echo # End of 11.1
--echo #
--echo # MDEV-33988 DELETE (single table) to support table aliases
--echo #
create table t1 (c1 int, c2 int, c3 int);
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,7), (3,5,8);
create table t2 (id int auto_increment primary key, a int, key(a));
insert into t2(a) values (3), (5), (-1);
--echo # 1. The alias in delete coincides with the table name in IN subquery.
explain extended
delete from t1 t2 where t2.c1 in (select a from t2);
delete from t1 t2 where t2.c1 in (select a from t2);
select * from t1;
--echo # 2. The alias in delete is different from the alias in IN subquery
explain extended
delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
select * from t1;
--echo # 3. The alias in delete is the same as the alias in IN subquery.
explain extended
delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
select * from t1;
--echo # 4. The table in delete is the alias in IN subquery
explain extended
delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
select * from t1;
drop table t1, t2;
--echo # End of 11.6
|
