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
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