Brendan Jurd escribió: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Sat, Apr 26, 2008 at 6:02 AM, Tom Lane wrote: > > "Brendan Jurd" writes: > > > Has anyone had a close look at how hard it would be allow just the > > > "add to the end" capability? > > > > The problem is you can't guarantee anything about the ordering of the > > new value relative to the old ones. The OID it's assigned might be > > after them, or before them if the OID counter has wrapped around, > > or (with much smaller probability) between two existing ones. > > I see. So to add a value on to the end with guaranteed ordering, you > would have to rebuild the enum from scratch anyway.
The other alternative is to make the system generate the new OIDs in such a way that the ordering is preserved. This, of course, has a lot of problems of its own. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
