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Fix for the bug #3089: SUBSTRING bug when mixed with CONCAT and ORDER BY

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This commit is contained in:
ram@gw.mysql.r18.ru
2004-03-09 16:52:37 +04:00
parent 6a10859bee
commit 8ffd9a9190
3 changed files with 24 additions and 1 deletions
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10
mysql-test/r/func_str.result
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@ -624,3 +624,13 @@ Note 1003 select high_priority md5(_latin1'hello') AS `md5('hello')`,sha(_latin1
SELECT lpad(12345, 5, "#"); SELECT lpad(12345, 5, "#");
lpad(12345, 5, "#") lpad(12345, 5, "#")
12345 12345
create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t2 values (1,'cccccccccc'), (2,'dddddddddd');
select substring(concat(t1.str, t2.str), 1, 15) "name" from t1, t2
where t2.id=t1.id order by name;
name
aaaaaaaaaaccccc
bbbbbbbbbbddddd
drop table t1, t2;

13
mysql-test/t/func_str.test
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@ -360,3 +360,16 @@ explain extended select md5('hello'), sha('abc'), sha1('abc'), soundex(''), 'moo
# #
SELECT lpad(12345, 5, "#"); SELECT lpad(12345, 5, "#");
#
# Bug #3089
#
create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t2 values (1,'cccccccccc'), (2,'dddddddddd');
select substring(concat(t1.str, t2.str), 1, 15) "name" from t1, t2
where t2.id=t1.id order by name;
drop table t1, t2;

2
sql/item_strfunc.cc
View File

@ -1033,7 +1033,7 @@ void Item_func_substr::fix_length_and_dec()
} }
if (arg_count == 3 && args[2]->const_item()) if (arg_count == 3 && args[2]->const_item())
{ {
int32 length= (int32) args[2]->val_int() * default_charset_info->mbmaxlen; int32 length= (int32) args[2]->val_int() * collation.collation->mbmaxlen;
if (length <= 0) if (length <= 0)
max_length=0; /* purecov: inspected */ max_length=0; /* purecov: inspected */
else else