Re: extend pgbench expressions with functions

Hello Robert.

Here is a v34 b & c.

> // comments are not allowed.  I'd just remove the two you have.

Back to the eighties!

> It make no sense to exit(1) and then return 0, so don't do that.  I
> might write this code as:
> This would get rid of the internal-error case here altogether in favor
> of testing it via an assertion.

I've put assertions instead of exit in some places.

> I think that coerceToInt() should not exit(1) when an overflow occurs;

I think that it should, because the only sane option for the user is to 
fix the script and relaunch the bench: counting errors has no added value 
for the user.

The attached version does some error handling instead, too bad.

> Now, if rval is out of range of an integer, that is going to overflow
> while trying to see whether it should divide by zero.

I could not find a place where there where such potential issue. If the 
value is zero, it cannot overflow when cast to int. If it is not zero but 
it overflows, then it is an overflow, so it should overflow. Maybe I 
misunderstood your point.

-- 
Fabien.