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?
--
Michael