B4BY.588
Home
Terminal
Upload
information
Create File
Create Folder
About
Tools
:
/
usr
/
share
/
mysql-test
/
include
/
Filename :
explain.inc
back
Copy
# # 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)); eval explain $FORMAT 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"; eval explain $FORMAT select * from t1 where str is null; eval explain $FORMAT select * from t1 where str="foo"; eval explain $FORMAT select * from t1 ignore key (str) where str="foo"; eval explain $FORMAT select * from t1 use key (str,str) where str="foo"; #The following should give errors --error 1176 eval explain $FORMAT select * from t1 use key (str,str,foo) where str="foo"; --error 1176 eval explain $FORMAT select * from t1 ignore key (str,str,foo) where str="foo"; drop table t1; --eval explain $FORMAT select 1 create table t1 (a int not null); eval explain $FORMAT select count(*) from t1; insert into t1 values(1); eval explain $FORMAT select count(*) from t1; insert into t1 values(1); eval explain $FORMAT 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); eval explain $FORMAT 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; eval explain $FORMAT 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 eval EXPLAIN $FORMAT 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_EXITS 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 eval EXPLAIN $FORMAT 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); SELECT @@session.sql_mode INTO @old_sql_mode; SET SESSION sql_mode='ONLY_FULL_GROUP_BY'; # EXPLAIN EXTENDED (with subselect). used to crash. # This is actually a valid query for this sql_mode, # but it was transformed in such a way that it failed, see # Bug#12329653 - EXPLAIN, UNION, PREPARED STATEMENT, CRASH, SQL_FULL_GROUP_BY 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 # set @opt_sw_save= @@optimizer_switch; --disable_query_log if (`select locate('semijoin', @@optimizer_switch) > 0`) { set optimizer_switch='semijoin=off'; } --enable_query_log 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'); flush tables; eval EXPLAIN $FORMAT 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; eval EXPLAIN $FORMAT 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' ); drop tables t1, t2; set optimizer_switch= @opt_sw_save; --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; eval EXPLAIN $FORMAT 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); eval EXPLAIN $FORMAT 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'); eval EXPLAIN $FORMAT SELECT 1 FROM t1 WHERE 1 > ALL((SELECT 1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST ("")) WHERE t1.f1 GROUP BY t1.f1)); eval PREPARE stmt FROM 'EXPLAIN $FORMAT SELECT 1 FROM t1 WHERE 1 > ALL((SELECT 1 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; eval PREPARE stmt FROM 'EXPLAIN $FORMAT SELECT 1 FROM t1 WHERE 1 > ALL((SELECT 1 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#46860: --echo # Crash/segfault using EXPLAIN EXTENDED on query using UNION in subquery. --echo # --disable_warnings drop table if exists t1; --enable_warnings create table `t1` (`a` int); --error ER_NON_UNIQ_ERROR explain extended select 1 from `t1`, `t1` as `t2` where `t1`.`a` > all ( (select `a` from `t1` ) union (select `a`) ); drop table t1; --echo # --echo # BUG#30597: Change EXPLAIN output to include extrema of --echo # UNION components --echo # eval EXPLAIN $FORMAT SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 ; --echo # End BUG#30597 --echo # --echo # BUG#53562: EXPLAIN statement should hint when --echo # index is not used due to type conversion --echo # CREATE TABLE t1 (url char(1) PRIMARY KEY); INSERT INTO t1 VALUES ('1'),('2'),('3'),('4'),('5'); --echo --echo # Normally, lookup access on primary key is done EXPLAIN EXTENDED SELECT * FROM t1 WHERE url='1'; --echo --echo # Test that index can't be used for lookup due to type conversion --echo # (comparing char and int) SELECT * FROM t1 WHERE url=1; EXPLAIN EXTENDED SELECT * FROM t1 WHERE url=1; --echo --echo # Test that index can't be used for lookup due to collation mismatch SELECT * FROM t1 WHERE url='1' collate latin1_german2_ci; EXPLAIN EXTENDED SELECT * FROM t1 WHERE url='1' collate latin1_german2_ci; --echo --echo # Normally, range access on primary key is done EXPLAIN EXTENDED SELECT * FROM t1 WHERE url>'3'; --echo --echo # Test that range access on index can't be done due to type conversion --echo # (comparing char and int) SELECT * FROM t1 WHERE url>3; EXPLAIN EXTENDED SELECT * FROM t1 WHERE url>3; --echo --echo # Test that range access on index can't be done due to collation mismatch SELECT * FROM t1 WHERE url>'3' collate latin1_german2_ci; EXPLAIN EXTENDED SELECT * FROM t1 WHERE url>'3' collate latin1_german2_ci; --echo DROP TABLE t1; --echo # End BUG#53562 --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 # WL#4897: Add EXPLAIN INSERT/UPDATE/DELETE --echo # --echo # Coverage tests after code refactoring --echo # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2),(3); CREATE TABLE t2 (a INT); INSERT INTO t2 VALUES (3),(4),(5); # LIMIT <offset> is for SELECT, not for EXPLAIN OUTPUT: --echo # EXPLAIN must return 3 rows: eval EXPLAIN $FORMAT SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2,2; DROP TABLE t1, t2; --echo # End WL#4897 --echo End of 6.0 tests.