On Sun, 2011-01-09 at 16:59 -0500, Noah Misch wrote: > This begins the patch series for the design I recently proposed[1] for > avoiding > some table rewrites in ALTER TABLE ... ALTER COLUMN ... TYPE. I'm posting > these > patches today:
These sound very good. I have a concern that by making the ALTER TABLE more complex that we might not be able to easily tell if a rewrite happens, or not. Perhaps we should add a WITHOUT REWRITE clause? That would allow a user to specify that they do not wish a rewrite, so if the AT requires them to have one it would then fail. You might point out I didn't do anything like that for my ALTER TABLE patch, and I would agree with you. WITHOUT ACCESS EXCLUSIVE LOCK might be an option here also. -- Simon Riggs http://www.2ndQuadrant.com/books/ PostgreSQL Development, 24x7 Support, Training and Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
