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Bug #17043: Casting trimmed string to decimal loses precision

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Results of string functions were being converted to decimals by first
  being converted to integers, resulting in a loss of precision.


mysql-test/r/func_str.result:
  Add new results
mysql-test/t/func_str.test:
  Add new regression test
sql/item_strfunc.cc:
  Convert string function results to decimal using string-to-decimal conversion
sql/item_strfunc.h:
  Add Item_str_func::val_decimal()
This commit is contained in:
unknown
2006-03-14 02:04:43 -08:00
parent 358e08836a
commit d48cfa8ac7
4 changed files with 33 additions and 1 deletions
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10
mysql-test/r/func_str.result
View File

@ -1030,3 +1030,13 @@ c res
y,abc abc
y,abc abc
drop table t1;
select cast(rtrim(' 20.06 ') as decimal(19,2));
cast(rtrim(' 20.06 ') as decimal(19,2))
20.06
select cast(ltrim(' 20.06 ') as decimal(19,2));
cast(ltrim(' 20.06 ') as decimal(19,2))
20.06
select cast(rtrim(ltrim(' 20.06 ')) as decimal(19,2));
cast(rtrim(ltrim(' 20.06 ')) as decimal(19,2))
20.06
End of 5.0 tests

9
mysql-test/t/func_str.test
View File

@ -684,4 +684,11 @@ insert into t1 values ('y,abc'),('y,abc');
select c, substring_index(lcase(c), @q:=',', -1) as res from t1;
drop table t1;
# End of 5.0 tests
#
# Bug #17043: Casting trimmed string to decimal loses precision
#
select cast(rtrim(' 20.06 ') as decimal(19,2));
select cast(ltrim(' 20.06 ') as decimal(19,2));
select cast(rtrim(ltrim(' 20.06 ')) as decimal(19,2));
--echo End of 5.0 tests

14
sql/item_strfunc.cc
View File

@ -80,6 +80,20 @@ String *Item_str_func::check_well_formed_result(String *str)
}
my_decimal *Item_str_func::val_decimal(my_decimal *decimal_value)
{
DBUG_ASSERT(fixed == 1);
char buff[64];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
if (!res)
return 0;
(void)str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
res->length(), res->charset(), decimal_value);
return decimal_value;
}
double Item_str_func::val_real()
{
DBUG_ASSERT(fixed == 1);

1
sql/item_strfunc.h
View File

@ -33,6 +33,7 @@ public:
Item_str_func(List<Item> &list) :Item_func(list) {decimals=NOT_FIXED_DEC; }
longlong val_int();
double val_real();
my_decimal *val_decimal(my_decimal *);
enum Item_result result_type () const { return STRING_RESULT; }
void left_right_max_length();
String *check_well_formed_result(String *str);