Re: PG function call

On Thu, Oct 06, 2005 at 09:06:59AM -0500, smile khmer wrote:
> Dear all,
>
> Does anyone know how index searching work in PG. I've explored the
> source code of PG, for btree, for searching, it will call the
> functions in file btcompare.c. As I've made a printf in the functions
> of the file btcompare.c. When I compile and run PG, it get into
> loop,..... the messages are printed and printed .....

Not a loop -- the function may just be called a lot of times.

> I want to know how the function called happen in Postgres,
> it seems that it doesn't call the function directly !

The code gets function pointers through the catalogs, so they will be
called even if you don't see a direct function call. At some time the
code will ask for the equality function for such-and-such datatype, then
call it.

--
Alvaro Herrera http://www.amazon.com/gp/registry/CTMLCN8V17R4
"Acepta los honores y aplausos y perderás tu libertad"