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hf@deer.(none) 2005-10-11 14:58:25 +05:00
commit be0917049b
3 changed files with 50 additions and 1 deletions
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15
mysql-test/r/type_float.result
View File

@ -229,3 +229,18 @@ create table t1 (s1 float(0,2));
ERROR 42000: For float(M,D), double(M,D) or decimal(M,D), M must be >= D (column 's1').
create table t1 (s1 float(1,2));
ERROR 42000: For float(M,D), double(M,D) or decimal(M,D), M must be >= D (column 's1').
create table t1 (d double(10,1));
create table t2 (d double(10,9));
insert into t1 values ("100000000.0");
insert into t2 values ("1.23456780");
create table t3 select * from t2 union select * from t1;
select * from t3;
d
1.234567800
100000000.000000000
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
`d` double(22,9) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1, t2, t3;

13
mysql-test/t/type_float.test
View File

@ -146,6 +146,19 @@ select * from t1 where reckey=109;
select * from t1 where reckey=1.09E2;
drop table t1;
#
# Bug #13372 (decimal union)
#
create table t1 (d double(10,1));
create table t2 (d double(10,9));
insert into t1 values ("100000000.0");
insert into t2 values ("1.23456780");
create table t3 select * from t2 union select * from t1;
select * from t3;
show create table t3;
drop table t1, t2, t3;
# End of 4.1 tests
#

23
sql/item.cc
View File

@ -5705,6 +5705,8 @@ enum_field_types Item_type_holder::get_real_type(Item *item)
bool Item_type_holder::join_types(THD *thd, Item *item)
{
uint max_length_orig= max_length;
uint decimals_orig= decimals;
DBUG_ENTER("Item_type_holder::join_types");
DBUG_PRINT("info:", ("was type %d len %d, dec %d name %s",
fld_type, max_length, decimals,
@ -5731,7 +5733,10 @@ bool Item_type_holder::join_types(THD *thd, Item *item)
}
else
max_length= max(max_length, display_length(item));
if (Field::result_merge_type(fld_type) == STRING_RESULT)
switch (Field::result_merge_type(fld_type))
{
case STRING_RESULT:
{
const char *old_cs, *old_derivation;
old_cs= collation.collation->name;
@ -5745,7 +5750,23 @@ bool Item_type_holder::join_types(THD *thd, Item *item)
"UNION");
DBUG_RETURN(TRUE);
}
break;
}
case REAL_RESULT:
{
if (decimals != NOT_FIXED_DEC)
{
int delta1= max_length_orig - decimals_orig;
int delta2= item->max_length - item->decimals;
max_length= min(max(delta1, delta2) + decimals,
(fld_type == MYSQL_TYPE_FLOAT) ? FLT_DIG+6 : DBL_DIG+7);
}
else
max_length= (fld_type == MYSQL_TYPE_FLOAT) ? FLT_DIG+6 : DBL_DIG+7;
break;
}
default:;
};
maybe_null|= item->maybe_null;
get_full_info(item);