On Fri, Dec 23, 2022 at 05:51:28PM +0900, Michael Paquier wrote: > On Thu, Dec 22, 2022 at 09:27:24PM -0600, Justin Pryzby wrote: > > This would do a single seqscan: > > SELECT format('ALTER TABLE %I ALTER COLUMN %I TYPE TEXT', > > attrelid::regclass, attname) FROM pg_attribute WHERE > > atttypid='aclitem'::regtype; -- AND ... > > \gexec > > FWIW, I find the use of a FOR loop with a DO block much cleaner to > follow in this context, so something like the attached would be able > to group the two queries and address your point on O(N^2). Do you > like that?
LGTM. Thanks. -- Justin