1. Table AM with a 6-byte TID. 2. Table AM with a custom locator format, which could be TID-like. 3. Table AM with no locators.
Getting into having #1 first to work out would already be really useful for users.
What exactly would be useful for *users*? Any kind of API itself is completely useless for users, because they are users, not developers. Storage API could be useful for developers to implement storage AMs whose in turn could be useful for users. Then while saying that #1 is useful for users, it would be nice to keep in mind particular storage AMs which can be implemented using #1.
------ Alexander Korotkov Postgres Professional: http://www.postgrespro.com The Russian Postgres Company