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A fix for a crashing bug #7101, which occures when the

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expression involving LEFT() function is used in GROUP BY
field.


mysql-test/r/func_str.result:
  A result for bug #7101 test case
mysql-test/t/func_str.test:
  Test case for bug #7101
This commit is contained in:
unknown 2004-12-10 00:17:43 +02:00
parent ac96a2bbcb
commit 41a61e84d7
4 changed files with 18 additions and 2 deletions
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6
mysql-test/r/func_str.result
View file

@ -685,3 +685,9 @@ drop table t1;
select left(1234, 3) + 0; select left(1234, 3) + 0;
left(1234, 3) + 0 left(1234, 3) + 0
123 123
create table t1 (a int not null primary key, b varchar(40), c datetime);
insert into t1 (a,b,c) values (1,'Tom',now()),(2,'ball games',now()), (3,'Basil',now()), (4,'Dean',now()),(5,'Ellis',now()), (6,'Serg',now()), (7,'Sergei',now()),(8,'Georg',now()),(9,'Salle',now()),(10,'Sinisa',now());
select count(*) as total, left(c,10) as reg from t1 group by reg order by reg desc limit 0,12;
total reg
10 2004-12-10
drop table t1;

8
mysql-test/t/func_str.test
View file

@ -421,3 +421,11 @@ drop table t1;
# #
select left(1234, 3) + 0; select left(1234, 3) + 0;
#
# Bug #7101: bug with LEFT() when used as a field in GROUP BY aggregation
#
create table t1 (a int not null primary key, b varchar(40), c datetime);
insert into t1 (a,b,c) values (1,'Tom',now()),(2,'ball games',now()), (3,'Basil',now()), (4,'Dean',now()),(5,'Ellis',now()), (6,'Serg',now()), (7,'Sergei',now()),(8,'Georg',now()),(9,'Salle',now()),(10,'Sinisa',now());
select count(*) as total, left(c,10) as reg from t1 group by reg order by reg desc limit 0,12;
drop table t1;

5
sql/item_strfunc.cc
View file

@ -955,8 +955,9 @@ String *Item_func_left::val_str(String *str)
if (res->length() <= (uint) length || if (res->length() <= (uint) length ||
res->length() <= (char_pos= res->charpos(length))) res->length() <= (char_pos= res->charpos(length)))
return res; return res;
str_value.set(*res, 0, char_pos);
return &str_value; tmp_value.set(*res, 0, char_pos);
return &tmp_value;
} }

1
sql/item_strfunc.h
View file

@ -162,6 +162,7 @@ public:
class Item_func_left :public Item_str_func class Item_func_left :public Item_str_func
{ {
String tmp_value;
public: public:
Item_func_left(Item *a,Item *b) :Item_str_func(a,b) {} Item_func_left(Item *a,Item *b) :Item_str_func(a,b) {}
String *val_str(String *); String *val_str(String *);