> I'm wondering how useful it is to store explicit representations of the
> system attributes in pg_attribute. We could very easily hard-wire those
> things instead, which would make for a large reduction in the number of
> entries in pg_attribute. (In the current regression database nearly
> half of the rows have attnum < 0.) I think the impact on the backend
> would be pretty minimal, but I'm wondering if removing these entries
> would be likely to break any client-side code. Does anyone know of
> client code that actually pays attention to pg_attribute rows with
> negative attnums?
Well, apart from a "attnum > 0" clause in phpPgAdmin, I don't think so...
Chris