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Fix for bug#44743: Join in combination with concat does not always work

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bug#44766: valgrind error when using convert() in a subquery

Problem: input and output buffers may be the same 
converting a string to some charset. 
That may lead to wrong results/valgrind warnings.  

Fix: use different buffers.
This commit is contained in:
Ramil Kalimullin
2009-05-21 13:06:43 +05:00
parent 8b5ea27aac
commit fe350c59aa
7 changed files with 108 additions and 2 deletions
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31
mysql-test/r/func_concat.result
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@ -89,3 +89,34 @@ c1 c2
First
DROP TABLE t1;
# End of 5.0 tests
#
# Bug #44743: Join in combination with concat does not always work
#
CREATE TABLE t1 (
a VARCHAR(100) NOT NULL DEFAULT '0',
b VARCHAR(2) NOT NULL DEFAULT '',
c VARCHAR(2) NOT NULL DEFAULT '',
d TEXT NOT NULL,
PRIMARY KEY (a, b, c),
KEY (a)
) DEFAULT CHARSET=utf8;
INSERT INTO t1 VALUES ('gui_A', 'a', 'b', 'str1'),
('gui_AB', 'a', 'b', 'str2'), ('gui_ABC', 'a', 'b', 'str3');
CREATE TABLE t2 (
a VARCHAR(100) NOT NULL DEFAULT '',
PRIMARY KEY (a)
) DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES ('A'), ('AB'), ('ABC');
SELECT CONCAT('gui_', t2.a), t1.d FROM t2
LEFT JOIN t1 ON t1.a = CONCAT('gui_', t2.a) AND t1.b = 'a' AND t1.c = 'b';
CONCAT('gui_', t2.a) d
gui_A str1
gui_AB str2
gui_ABC str3
EXPLAIN SELECT CONCAT('gui_', t2.a), t1.d FROM t2
LEFT JOIN t1 ON t1.a = CONCAT('gui_', t2.a) AND t1.b = 'a' AND t1.c = 'b';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 102 NULL 3 Using index
1 SIMPLE t1 eq_ref PRIMARY,a PRIMARY 318 func,const,const 1
DROP TABLE t1, t2;
# End of 5.1 tests