Andres Freund <and...@2ndquadrant.com> writes: > On 2014-03-17 19:55:01 -0400, Tom Lane wrote: >>> I think the best way to really cleanup a table is to use something like: >>> ALTER TABLE rew ALTER COLUMN data TYPE text USING (data);
>> Um... don't we have logic in there that's smart enough to short-circuit >> that? > Not with USING present I think? regression=# create table foo as select generate_series(1,1000000) as data; SELECT 1000000 Time: 575.113 ms regression=# alter table foo alter column data type int4 using (data); ALTER TABLE Time: 1001.859 ms regression=# alter table foo alter column data type int4 using (data); ALTER TABLE Time: 0.821 ms regression=# alter table foo alter column data type int8 using (data); ALTER TABLE Time: 677.810 ms regression=# alter table foo alter column data type int8 using (data); ALTER TABLE Time: 1.085 ms Looks like it's smart enough to me. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers