On Thu, Dec 22, 2011 at 10:54 PM, Alvaro Herrera <alvhe...@commandprompt.com> wrote: > I agree with Robert that this usage of ALTER TABLE ONLY is slightly > different from other usages of the same command, but I disagree that > this means that we need another command to do what we want to do here. > IOW, I prefer to keep the syntax we have.
Another disadvantage of the current syntax becomes evident when you look at the pg_dump output. If you pg_dump a regular constraint, the constraint gets added as part of the table definition, and the rows are all checked as they are inserted. If you pg_dump an ONLY constraint, the constraint gets added after loading the data, requiring an additional full-table scan to validate it. >> > I am tempted to say we should revert this and rethink. I don't >> > believe we are only a small patch away from finding all the bugs here. >> >> Sure, if we all think that CREATE TABLE should support ONLY CONSTRAINT type >> of syntax, then +1 for reverting this and a subsequent revised submission. > > I don't think this is a given ... In fact, IMO if we're only two or > three fixes away from having it all nice and consistent, I think > reverting is not necessary. Sure. It's the "if" part of that sentence that I'm not too sure about. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers