Daniel Bausch <DanielBausch@gmx.de> writes:
> does anybody know a paper (or any document but the code itself) containing a
> description of the current cost model used by the query optimizer/planner.
If you look on the project website you can find slides from various
conference presentations that give overviews of the planner. But if you
want details you'll have to read the code. It's at least moderately
well commented, though. Most of the skeletons in this particular
closet are in costsize.c and selfuncs.c.
regards, tom lane
