Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> mac_man2005@hotmail.it wrote:
>> Unfortunately I'm lost into the code... any good soul helping me to
>> understand what should be the precise part to be modified?
> I think you should print the file and read it several times until you
> understand what's going on. Then you can start thinking where and how
> to modify it.
Also, go find a copy of Knuth volume 3, because a whole lot of the
comments assume you've read Knuth's discussion of external sorting.
regards, tom lane