summaryrefslogtreecommitdiffstats
path: root/mysql-test/main/explain.test
blob: 5269fccf78bd2ab09751e5b1ecbcf3b209c072fe (plain)
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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
#
# Test of different EXPLAINs

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (id int not null, str char(10), unique(str));
explain select * from t1;
insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
select * from t1 where str is null;
select * from t1 where str="foo";
explain select * from t1 where str is null;
explain select * from t1 where str="foo";
explain select * from t1 ignore key (str) where str="foo";
explain select * from t1 use key (str,str) where str="foo";

#The following should give errors
--error 1176
explain select * from t1 use key (str,str,foo) where str="foo";
--error 1176
explain select * from t1 ignore key (str,str,foo) where str="foo";
drop table t1;

explain select 1;

create table t1 (a int not null);
explain select count(*) from t1;
insert into t1 values(1);
explain select count(*) from t1;
insert into t1 values(1);
explain select count(*) from t1;
drop table t1;

#
# Bug #3403 Wrong encoding in EXPLAIN SELECT output
#
set names koi8r;
create table ��� (���0 int, ���1 int, key ���0 (���0), key ���01 (���0,���1));
insert into ��� (���0) values (1);
insert into ��� (���0) values (2);
explain select ���0 from ��� where ���0=1;
drop table ���;
set names latin1;

# End of 4.1 tests


#
# Bug#15463: EXPLAIN SELECT..INTO hangs the client (QB, command line)
#
select 3 into @v1;
explain select 3 into @v1;

#
# Bug#22331: Wrong WHERE in EXPLAIN EXTENDED when all expressions were
#            optimized away.
#
create table t1(f1 int, f2 int);
insert into t1 values (1,1);
create view v1 as select * from t1 where f1=1;
explain extended select * from v1 where f2=1;
explain extended select * from t1 where 0;
explain extended select * from t1 where 1;
explain extended select * from t1 having 0;
explain extended select * from t1 having 1;
drop view v1;
drop table t1;

#
# Bug #32241: memory corruption due to large index map in 'Range checked for 
#             each record'
#

CREATE TABLE t1(c INT);
INSERT INTO t1 VALUES (),();

CREATE TABLE t2 (b INT,
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b));

INSERT INTO t2 VALUES (),(),();

# We only need to make sure that there is no buffer overrun and the index map
# is displayed correctly
--replace_column 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X 9 X
EXPLAIN SELECT 1 FROM
  (SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2;
DROP TABLE t2;
DROP TABLE t1;

#
# Bug #34773: query with explain extended and derived table / other table
# crashes server
#

CREATE TABLE t1(a INT);
CREATE TABLE t2(a INT);
INSERT INTO t1 VALUES (1),(2);
INSERT INTO t2 VALUES (1),(2);

EXPLAIN EXTENDED SELECT 1
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;

EXPLAIN EXTENDED SELECT 1
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;

prepare s1 from 
'EXPLAIN EXTENDED SELECT 1  
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
execute s1;

prepare s1 from 
'EXPLAIN EXTENDED SELECT 1  
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
execute s1;
execute s1;

DROP TABLE t1,t2;


#
# Bug #43354: Use key hint can crash server in explain extended query
#

CREATE TABLE t1 (a INT PRIMARY KEY);

--error ER_KEY_DOES_NOT_EXISTS
EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a);

DROP TABLE t1;

#
# Bug#45989 memory leak after explain encounters an error in the query
#
CREATE TABLE t1(a LONGTEXT);
INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
--error ER_BAD_FIELD_ERROR
EXPLAIN SELECT DISTINCT 1 FROM t1,
        (SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) as d1
         WHERE t1.a = d1.a;
DROP TABLE t1;

--echo #
--echo # Bug#48295:
--echo # explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
--echo #

CREATE TABLE t1 (f1 INT not null);

SELECT @@session.sql_mode INTO @old_sql_mode;
SET SESSION sql_mode='ONLY_FULL_GROUP_BY';

# EXPLAIN EXTENDED (with subselect). used to crash. should give NOTICE.
# Before moving max/min optimization to optimize phase this statement
# generated error, but as far as original query do not contain aggregate
# function user should not see error
#  --error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
EXPLAIN EXTENDED SELECT 1 FROM t1
                          WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );

SET SESSION sql_mode=@old_sql_mode;

DROP TABLE t1;

--echo End of 5.0 tests.

--echo #
--echo # Bug#37870: Usage of uninitialized value caused failed assertion.
--echo #
create table t1 (dt datetime not null, t time not null);
create table t2 (dt datetime not null);
insert into t1 values ('2001-01-01 1:1:1', '1:1:1'),
('2001-01-01 1:1:1', '1:1:1');
insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
SET @save_join_cache_level=@@join_cache_level;
SET join_cache_level=0;
flush tables;
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
flush tables;
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
flush tables;
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' ); 
flush tables;
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
SET join_cache_level=@save_join_cache_level;
drop tables t1, t2;

--echo #
--echo # Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query
--echo #

CREATE TABLE t1 (c int);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2 (d int);
INSERT INTO t2 VALUES (NULL), (0);
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
DROP TABLE t1, t2;

--echo #
--echo # Bug#30302: Tables that were optimized away are printed in the
--echo #            EXPLAIN EXTENDED warning.
--echo #
create table t1(f1 int);
create table t2(f2 int);
insert into t1 values(1);
insert into t2 values(1),(2);
explain extended select * from t1 where f1=1;
explain extended select * from t1 join t2 on f1=f2 where f1=1;
drop table t1,t2;

--echo #
--echo # Bug #48419: another explain crash..
--echo #
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (b BLOB, KEY b(b(100)));
INSERT INTO t2 VALUES ('1'), ('2'), ('3');

FLUSH TABLES;

EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a);

DROP TABLE t1, t2;

--echo #
--echo # Bug #48573: difference of index selection between rpm binary and
--echo #             .tar.gz, windows vs linux..
--echo #

CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
INSERT INTO t1 VALUES(4, 1, 1, 1);
INSERT INTO t1 VALUES(3, 1, 1, 1);
INSERT INTO t1 VALUES(2, 1, 1, 1);
INSERT INTO t1 VALUES(1, 1, 1, 1);
INSERT INTO t1 VALUES(5, 2, 1, 1);
INSERT INTO t1 VALUES(6, 2, 1, 1);
INSERT INTO t1 VALUES(7, 3, 1, 1);
INSERT INTO t1 VALUES(9, 3, 1, 1);
INSERT INTO t1 VALUES(10, 4, 1, 1);
INSERT INTO t1 VALUES(11, 4, 1, 1);

EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;

DROP TABLE t1;

--echo #
--echo # Bug#56814 Explain + subselect + fulltext crashes server
--echo #

CREATE TABLE t1(f1 VARCHAR(6) NOT NULL,
FULLTEXT KEY(f1),UNIQUE(f1));
INSERT INTO t1 VALUES ('test');

EXPLAIN SELECT 1 FROM t1
WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST (""))
WHERE t1.f1 GROUP BY t1.f1));

PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
 WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a
 ON (MATCH(t1.f1) AGAINST (""))
 WHERE t1.f1 GROUP BY t1.f1))';

EXECUTE stmt;
EXECUTE stmt;

DEALLOCATE PREPARE stmt;

PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
 WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a
 ON (MATCH(t1.f1) AGAINST (""))
 WHERE t1.f1 GROUP BY t1.f1))';

EXECUTE stmt;
EXECUTE stmt;

DEALLOCATE PREPARE stmt;

DROP TABLE t1;

--echo End of 5.1 tests.

--echo #
--echo # Bug#11829785 EXPLAIN EXTENDED CRASH WITH RIGHT OUTER JOIN, SUBQUERIES
--echo #

CREATE TABLE t1(a INT);

INSERT INTO t1 VALUES (0), (0);

PREPARE s FROM 
'EXPLAIN EXTENDED
SELECT SUBSTRING(1, (SELECT 1 FROM t1 a1 RIGHT OUTER JOIN t1 ON 0)) AS d
FROM t1 WHERE 0 > ANY (SELECT @a FROM t1)';

--error ER_SUBQUERY_NO_1_ROW
EXECUTE s;

DEALLOCATE PREPARE s;
DROP TABLE t1;

--echo #
--echo # Bug#776295: EXPLAIN EXTENDED with always false multiple equality
--echo #             in the WHERE condition of a derived table
--echo #

CREATE TABLE t1 (a int) ;

CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (8);

set @tmp_optimizer_switch=@@optimizer_switch;
set optimizer_switch='derived_merge=off,derived_with_keys=off';
EXPLAIN EXTENDED
SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
set optimizer_switch=@tmp_optimizer_switch;

DROP TABLE t1,t2;

--echo #
--echo # MDEV-7215: EXPLAIN REPLACE produces an error:
--echo # Column count doesn't match value count 
--echo #
create table t1 (a int);
insert into t1 values (1);
create table t2 (b int, c int);

replace into t2 select 100, (select a from t1);
explain replace into t2 select 100, (select a from t1);
#analyze replace into t2 select 100, (select a from t1);

drop table t1, t2;

--echo # End of 10.1 tests

--echo #
--echo # End of 10.2 test
--echo #

--echo #
--echo # MDEV-25564: Server crashed on running some EXPLAIN statements
--echo #

EXPLAIN (SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);

--echo #
--echo # MDEV-23160: SIGSEGV in Explain_node::print_explain_for_children on UNION SELECT
--echo #

CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);

EXPLAIN
SELECT *
FROM t1
WHERE
  a IN (SELECT a FROM t1
        UNION
        SELECT a FROM t1 ORDER BY (SELECT a))
UNION
  SELECT * FROM t1 ORDER BY (SELECT a);
drop table t1;

--disable_ps_protocol
explain
VALUES ( (VALUES (2))) UNION VALUES ( (SELECT 3));
--enable_ps_protocol

--echo #
--echo # End of 10.4 tests
--echo #

CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (3),(4);

EXPLAIN SELECT * FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
prepare stmt from "EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6)";
execute stmt;
execute stmt;

# Cleanup

DROP TABLE t1, t2;

--echo #
--echo # End of 10.5 tests
--echo #