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Fixed bug#16861: User defined variable can have a wrong value if a tmp table was

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used.

The Item::save_in_field() function is called from fill_record() to fill the 
new row with data while execution of the CREATE TABLE ... SELECT statement.
Item::save_in_field() calls val_xxx() methods in order to get values.
val_xxx() methods do not take into account the result field. Due to this
Item_func_set_user_var::val_xxx() methods returns values from the original
table, not from the temporary one.

The save_in_field() member function is added to the Item_func_set_user_var
class. It detects whether the result field should be used and properly updates
the value of the user variable.
This commit is contained in:
evgen@moonbone.local
2007-01-09 23:24:56 +03:00
parent ac48c8bae1
commit e098f736e1
4 changed files with 112 additions and 2 deletions
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9
mysql-test/r/user_var.result
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@@ -301,7 +301,14 @@ select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
select @var;
@var
3
drop table t1;
create table t2 as select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
select * from t2;
@var:=f2
3
select @var;
@var
3
drop table t1,t2;
insert into city 'blah';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''blah'' at line 1
SHOW COUNT(*) WARNINGS;