ORDER BY logic in PostgreSQL source code

On Wed, 10 Nov 2021 at 11:57, Sajti Zsolt Zoltán <qnwbq9@inf.elte.hu> wrote:

I'm currently working on a GiST extension for PostgreSQL and I ran into strange ORDER BY results during my queries.

Because I can't find the problem in my source code, I want to investigate the issue by looking at the PostgreSQL source,
maybe inserting extra log messages.
While trying to do this, I came to the conclusion that I need developer help, because I can't find the part of the source code
where the ORDER BY logic is implemented.

Could you please help, by telling me which files should I take a look at?

Thanks in advance!

I think you can start by looking into the function grouping_planner
and explore further by going through the route of it.

--
Regards,
Rafia Sabih