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bug #15745 (COUNT(DISTINCT CONCAT(x,y)) returns wrong result

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holyfoot@deer.(none) 2006-03-05 20:48:31 +04:00
parent 1a07140515
commit a920d0df86
3 changed files with 48 additions and 3 deletions
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21
mysql-test/r/distinct.result
View file

@ -512,3 +512,24 @@ id IFNULL(dsc, '-')
2 line number two
3 line number three
drop table t1;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
x varchar(20) default NULL,
y decimal(10,0) default NULL,
PRIMARY KEY (ID),
KEY (y)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES
(1,'ba','-1'),
(2,'ba','1150'),
(306,'ba','-1'),
(307,'ba','1150'),
(611,'ba','-1'),
(612,'ba','1150');
select count(distinct x,y) from t1;
count(distinct x,y)
2
select count(distinct concat(x,y)) from t1;
count(distinct concat(x,y))
2
drop table t1;

24
mysql-test/t/distinct.test
View file

@ -358,3 +358,27 @@ select distinct id, IFNULL(dsc, '-') from t1;
drop table t1;
# End of 4.1 tests
#
# Bug #15745 ( COUNT(DISTINCT CONCAT(x,y)) returns wrong result)
#
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
x varchar(20) default NULL,
y decimal(10,0) default NULL,
PRIMARY KEY (ID),
KEY (y)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES
(1,'ba','-1'),
(2,'ba','1150'),
(306,'ba','-1'),
(307,'ba','1150'),
(611,'ba','-1'),
(612,'ba','1150');
select count(distinct x,y) from t1;
select count(distinct concat(x,y)) from t1;
drop table t1;

6
sql/item_sum.cc
View file

@ -2541,9 +2541,9 @@ bool Item_sum_count_distinct::setup(THD *thd)
Field *f= *field;
enum enum_field_types type= f->type();
tree_key_length+= f->pack_length();
if (!f->binary() && (type == MYSQL_TYPE_STRING ||
type == MYSQL_TYPE_VAR_STRING ||
type == MYSQL_TYPE_VARCHAR))
if ((type == MYSQL_TYPE_VARCHAR) ||
!f->binary() && (type == MYSQL_TYPE_STRING ||
type == MYSQL_TYPE_VAR_STRING))
{
all_binary= FALSE;
break;