"Alice Lottini" <alice_lottini(at)yahoo(dot)it> writes:
> Does anybody know where I can find some documentation about the PostgreSQL =
> optimizer?
Aside from the general info in the Developer's Guide, there are README
files in the source tree that you should look at:
src/backend/optimizer/README
src/backend/optimizer/plan/README
After that, start reading the code ...
regards, tom lane