Comment 1 for bug 482846

The issue is that you are using integer arithmetic, which is described at:
http://dev.mysql.com/doc/refman/5.1/en/arithmetic-functions.html

Not much we can do with this, as we are trying to be compatible with MySQL.

We should however consider to find a way to create a warning in cases when you get overflow.

I will create a worklog entry for this.