Hey folks, I have a newbie developer question. I'm currently taking a course called Database Systems & Implementation at Rochester Institute of Technology and we've split up into groups and are working on extending Postgres to get some experience with a real-world DBMS (as well as the open-source initiative). My group is working on implementing the UNIQUE functionality in indexes other than the b-tree (which is a TODO item on the postgres website). We've been digging through the src/backend/access/hash/ and we're having a hard time figuring out the correct way to walk through items in a page. Is this what the hashbeginscan() method is for? If so, what should we provide for the keysz and scankey parameters? backend/access/index/genam.c says these parameters are "key count" and "scan key" respectively, but I'm still sort of lost on what these should be and how we get them (I couldn't find any code that actually called the hashbeginscan() function to use as reference).
Bear with me...I know it's the last thing you all want to hear but I'm more a java developer than a C one, but I'm workin' on it :-D. Is there some sort of reference equivalent of Javadocs that would show all the files, the functions, the descriptions of the parameters, etc? As of now, we're just grepping the code to find where else specific functions are used and trying to figure it all out that way.
Thanks so much for the help (now and for the stuff in the future I'm sure I'll be bugging you all about).