Hi, When I do the following: ALTER TABLE table ADD COLUMN numeric(x) DEFAULT NULL; The table is rewritten whereas notes section on the manual page for ALTER TABLE says otherwise (which holds true for most of the cases though). http://www.postgresql.org/docs/devel/static/sql-altertable.html As an example, postgres=# create table test as select generate_series(1,1000000) as a; SELECT 1000000 postgres=# select oid, relname, relfilenode from pg_class where relname = 'test'; oid | relname | relfilenode -------+---------+------------- 16709 | test | 16709 (1 row) postgres=# alter table test add column b numeric(2) DEFAULT NULL; ALTER TABLE -- rewritten postgres=# select oid, relname, relfilenode from pg_class where relname = 'test'; oid | relname | relfilenode -------+---------+------------- 16709 | test | 16713 (1 row) postgres=# alter table test add column c int DEFAULT NULL; ALTER TABLE -- not rewritten postgres=# select oid, relname, relfilenode from pg_class where relname = 'test'; oid | relname | relfilenode -------+---------+------------- 16709 | test | 16713 (1 row) postgres=# alter table test add column d char(5) DEFAULT NULL; ALTER TABLE -- rewritten, again postgres=# select oid, relname, relfilenode from pg_class where relname = 'test'; oid | relname | relfilenode -------+---------+------------- 16709 | test | 16717 So, when the type of the new column has type modifier like numeric(x), char(x) etc. do, this happens. Is this intentional and/or documented somewhere else? If not, should it be documented? -- Amit -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
