Global variable/memory context for PostgreSQL functions

Dear PostgreSQL Developers, I'm currently working on a GiST extension (a new index structure) for PostgreSQL and I want to make it as customizable as I can. To achieve my goal I'm trying to take advantage of the options GiST support function to provide extra parameters to the operator class. Be

ORDER BY logic in PostgreSQL source code

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