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fixed bug in subselect value storing

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mysql-test/r/subselect.result:
  test for bug in subselect value storing
mysql-test/t/subselect.test:
  test for bug in subselect value storing
This commit is contained in:
unknown 2002-10-11 17:00:11 +03:00
parent 16f5d95308
commit 261c22a87a
5 changed files with 24 additions and 6 deletions
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3
mysql-test/r/subselect.result
View File

@ -159,6 +159,9 @@ UNIQUE KEY `email` (`email`)
INSERT INTO inscrit (pseudo,email) VALUES ('joce','test');
INSERT INTO inscrit (pseudo,email) VALUES ('joce1','test1');
INSERT INTO inscrit (pseudo,email) VALUES ('2joce1','2test1');
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo='joce');
pseudo
joce
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo LIKE '%joce%');
Subselect returns more than 1 record
drop table if exists t1,t2,t3,t4,t5,attend,clinic,inscrit;

1
mysql-test/t/subselect.test
View File

@ -82,6 +82,7 @@ CREATE TABLE `inscrit` (
INSERT INTO inscrit (pseudo,email) VALUES ('joce','test');
INSERT INTO inscrit (pseudo,email) VALUES ('joce1','test1');
INSERT INTO inscrit (pseudo,email) VALUES ('2joce1','2test1');
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo='joce');
-- error 1240
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo LIKE '%joce%');

2
sql/item_subselect.cc
View File

@ -150,6 +150,8 @@ String *Item_singleval_subselect::val_str (String *str)
assign_null();
return 0;
}
// Assign temporary buffer with stored value
str_value.set(string_value, 0, string_value.length());
return &str_value;
}

13
sql/item_subselect.h
View File

@ -80,10 +80,16 @@ public:
class Item_singleval_subselect :public Item_subselect
{
protected:
longlong int_value; /* here stored integer value of this item */
double real_value; /* here stored real value of this item */
longlong int_value; /* Here stored integer value of this item */
double real_value; /* Here stored real value of this item */
/*
Here stored string value of this item.
(str_value used only as temporary buffer, because it can be changed
by Item::save_field)
*/
String string_value;
enum Item_result res_type; /* type of results */
public:
Item_singleval_subselect(THD *thd, st_select_lex *select_lex);
Item_singleval_subselect(Item_singleval_subselect *item):
@ -91,6 +97,7 @@ public:
{
int_value= item->int_value;
real_value= item->real_value;
string_value.set(item->string_value, 0, item->string_value.length());
max_length= item->max_length;
decimals= item->decimals;
res_type= item->res_type;

11
sql/sql_class.cc
View File

@ -884,9 +884,14 @@ bool select_singleval_subselect::send_data(List<Item> &items)
it->decimals= val_item->decimals;
it->binary= val_item->binary;
it->int_value= val_item->val_int();
String *s= val_item->val_str(&it->str_value);
if (s != &it->str_value)
it->str_value.set(*s, 0, s->length());
String *s= val_item->val_str(&it->string_value);
if (s != &it->string_value)
{
it->string_value.set(*s, 0, s->length());
}
// TODO: remove when correct charset handling appeared for Item
it->str_value.set(*s, 0, s->length()); // store charset
it->res_type= val_item->result_type();
}
it->assigned(1);