MySQL Bugs: #11557: Default values are set to zero when need to be rounded up to the next magnitude

Bug #11557	Default values are set to zero when need to be rounded up to the next magnitude
Submitted:	24 Jun 2005 22:38	Modified:	12 Jul 2005 11:43
Reporter:	Omer Barnir (OCA)	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S3 (Non-critical)
Version:	5.0.8/5.0.9 BK source	OS:	Linux (Linux SuSE 9.3)
Assigned to:	Alexey Botchkov	CPU Architecture:	Any

Description:
When default columns are defined as not null with a default value that includes a decimal portion, the value is rounded up/down when inderted/updated into the column.

However when the default value is set to a number that tounding up requires moving to the next magnitude (i.e. 9.6 --> 10, 99.9 --> 100 etc.) the value is set to zero as shown below:

omer@linux:~/source/src50_0620/client> ./mysql --sock=../mysql-test/var/tmp/master.sock --user=root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 5.0.8-beta-log

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> use test;
Database changed
mysql> create table t1 (
       f1 decimal unsigned not null default 17.49, 
       f2 decimal unsigned not null default 17.68, 
       f3 decimal unsigned not null default 99.2, 
       f4 decimal unsigned not null default 99.7, 
       f5 decimal unsigned not null default 104.49, 
       f6 decimal unsigned not null default 199.91, 
       f7 decimal unsigned not null default 999.9, 
       f8 decimal unsigned not null default 9999.99);
Query OK, 0 rows affected, 8 warnings (0.00 sec)

mysql> insert into t1 (f1) values (1);
Query OK, 1 row affected (0.00 sec)

mysql> select * from t1;
+----+----+----+----+-----+-----+----+----+
| f1 | f2 | f3 | f4 | f5  | f6  | f7 | f8 |
+----+----+----+----+-----+-----+----+----+
|  1 | 18 | 99 |  0 | 104 | 200 |  0 |  0 |
+----+----+----+----+-----+-----+----+----+
1 row in set (0.00 sec)

*** OBN> Note f4 sould have been 100, f6 1000 and f7 10000

mysql> insert into t1 values (2,2,2,2,2,2,2,2);
Query OK, 1 row affected (0.00 sec)

mysql> update t1 set f1=DEFAULT, f2=DEFAULT, f3=DEFAULT, f4=DEFAULT,  f5=DEFAULT, f6=DEFAULT, f7=DEFAULT, f8=DEFAULT where f1=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from t1;
+----+----+----+----+-----+-----+----+----+
| f1 | f2 | f3 | f4 | f5  | f6  | f7 | f8 |
+----+----+----+----+-----+-----+----+----+
|  1 | 18 | 99 |  0 | 104 | 200 |  0 |  0 |
| 17 | 18 | 99 |  0 | 104 | 200 |  0 |  0 |
+----+----+----+----+-----+-----+----+----+
2 rows in set (0.00 sec)

*** OBN> Note f4 sould have been 100, f6 1000 and f7 10000

mysql> exit
Bye
omer@linux:~/source/src50_0620/client>     

 

How to repeat:
Run the following in the mysql client:

use test;
drop table if exists t1;
create table t1 (
       f1 decimal unsigned not null default 17.49, 
       f2 decimal unsigned not null default 17.68, 
       f3 decimal unsigned not null default 99.2, 
       f4 decimal unsigned not null default 99.7, 
       f5 decimal unsigned not null default 104.49, 
       f6 decimal unsigned not null default 199.91, 
       f7 decimal unsigned not null default 999.9, 
       f8 decimal unsigned not null default 9999.99);
insert into t1 (f1) values (1);
select * from t1;
insert into t1 values (2,2,2,2,2,2,2,2);
update t1 set f1=DEFAULT, f2=DEFAULT, f3=DEFAULT, f4=DEFAULT,  
              f5=DEFAULT, f6=DEFAULT, f7=DEFAULT, f8=DEFAULT 
       where f1=2;
select * from t1;
drop table t1;

Suggested fix:
default values should be rounded up correctly

mysql> select * from t1;
+----+----+----+----+-----+-----+----+----+
| f1 | f2 | f3 | f4 | f5  | f6  | f7 | f8 |
+----+----+----+----+-----+-----+----+----+
|  1 | 18 | 99 |  0 | 104 | 200 |  0 |  0 |
| 17 | 18 | 99 |  0 | 104 | 200 |  0 |  0 |
+----+----+----+----+-----+-----+----+----+
2 rows in set (0.00 sec)

mysql> select version();
+------------------+
| version()        |
+------------------+
| 5.0.9-beta-debug |
+------------------+
1 row in set (0.00 sec)

thank you for the bug report.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/26932

Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html