Subject Re: [firebird-support] sum of integers results in an overflow
Author Steve Wiser
Helen Borrie wrote:
>
> At 08:04 AM 16/03/2007, you wrote:
> >Hello,
> >
> >We recently converted our applications from Interbase 5.6 to Firebird
> >1.5.3 Classic on linux. So far it has gone well and there have been a
> >lot of nice query speed-ups without us having to do anything! However,
> >I just received a defect notice from one of our developers that a report
> >is now failing our regression tests. We traced it down to a "select
> >sum" query that is adding up an integer column. We are using Dialect 1
> >since we are still in the middle of converting our trigger and stored
> >procedure code as well as trying to move off of the date-time fields.
> >Selecting a sum of integers where the result would overflow an integer
> >seems to work in Dialect 3, but not in Dialect 1. We can work around it
> >by casting the field to a double which seems to cause the sum to return
> >a double rather than an integer. However, I would prefer not to have to
> >find out where else in the code this might happen. I am not even sure
> >if this would overflow in Interbase since we never saw this behavior
> >before. We converted all of our test servers over, so I will have to
> >set one up and try it out...
> >
> >Anyways my question is: Is this a bug in Firebird with Dialect 1?
>
> It might be....but you are using an old version of Firebird
> 1.5.x. The latest release is v.1.5.4: you might like to download
> the release notes and check in the Bug Fixes section as to whether
> you are looking at a bug that might have been fixed.
>
> ./heLen

Thanks for the quick reply. I did take a look at the release notes for
1.5.4, but could not find anything specific to this problem. I will
download 1.5.4 and try it out on a test server.

-steve