Re: Cases where alter table set type varchar(longer length) stillneeds table rewrite

Jeremy Finzel <finzelj@gmail.com> writes:
> I have a table foo with 100 million rows, and a column:
>    - id character varying(20)
> The following command is the one that we expect to execute very quickly (we
> are not seeing any locking), but it is instead taking a very long time:
>    - ALTER TABLE foo ALTER COLUMN id TYPE varchar(100);

Hm, the code is supposed to avoid a table rewrite, but I wonder if
there's something else that's not being avoided, such as an index
rebuild or foreign-key verification.  Could we see the whole table
definition, eg from psql \d+ ?

                        regards, tom lane