Thanks for this information. It was really helpful.

Another problem that is facing me is altering existing functions. For example, what if I want to change the execution of the SUM function to work as follows:

select sum(a)
from mytable w(5);

which means to sum only 5 records or records that arrived in the last 5 minutes. Do I need to change the core code of PostgreSQL to implement such thing?

Islam Hegazy

----- Original Message ----- From: "Brendan Jurd" <[EMAIL PROTECTED]>
To: "Islam Hegazy" <[EMAIL PROTECTED]>
Cc: <>
Sent: Sunday, September 30, 2007 8:38 PM
Subject: Re: [HACKERS] adding operators

On 10/1/07, Islam Hegazy <[EMAIL PROTECTED]> wrote:
I am a graduate student in the University of Calgary. I want to add some new
operators to PostgreSQL to perform some specific tasks in a project I am
working in. My problem is that I cannot find my way into the code, where
should I start and where to find the documentation for the code.

There's no need to hack Postgres to add operators.  You can do so by
defining functions using CREATE FUNCTION, and then hooking operators
up to them using CREATE OPERATOR.


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