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Fixed bug #21698: erroneously a field could be replaced by an

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equal constant under any circumstances.
In fact this substitution can be allowed if the field is
not of a type string or if the field reference serves as 
an argument of a comparison predicate.
This commit is contained in:
igor@rurik.mysql.com
2006-09-07 11:06:37 -07:00
parent ca3229dc1b
commit 34206c6f80
10 changed files with 247 additions and 24 deletions
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27
mysql-test/t/func_str.test
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@@ -753,4 +753,31 @@ select cast(rtrim(ltrim(' 20.06 ')) as decimal(19,2));
select conv("18383815659218730760",10,10) + 0;
select "18383815659218730760" + 0;
#
# Bug #21698: substitution of a string field for a constant under a function
#
CREATE TABLE t1 (code varchar(10));
INSERT INTO t1 VALUES ('a12'), ('A12'), ('a13');
SELECT ASCII(code), code FROM t1 WHERE code='A12';
SELECT ASCII(code), code FROM t1 WHERE code='A12' AND ASCII(code)=65;
INSERT INTO t1 VALUES ('a12 '), ('A12 ');
SELECT LENGTH(code), code FROM t1 WHERE code='A12';
SELECT LENGTH(code), code FROM t1 WHERE code='A12' AND LENGTH(code)=5;
ALTER TABLE t1 ADD INDEX (code);
CREATE TABLE t2 (id varchar(10) PRIMARY KEY);
INSERT INTO t2 VALUES ('a11'), ('a12'), ('a13'), ('a14');
SELECT * FROM t1 INNER JOIN t2 ON t1.code=t2.id
WHERE t2.id='a12' AND (code < 'a00' OR LENGTH(code)=5);
EXPLAIN EXTENDED
SELECT * FROM t1 INNER JOIN t2 ON code=id
WHERE id='a12' AND (code < 'a00' OR LENGTH(code)=5);
DROP TABLE t1,t2;
--echo End of 5.0 tests