On Mon, Jan 04, 2010 at 03:55:15PM +0100, Albe Laurenz wrote: > donniehan wrote: > > postgres=# create table test1(c1 OID, c2 BIGINT); > > postgres=# create view v1 as select coalesce(c1,c2) from test1; > > postgres=# \d v1 > > SELECT COALESCE(test1.c1, test1.c2::oid) AS "coalesce" > > FROM test1; > > > > Although we can define the view v1 successfully, but we can > > not get what we want. > > If pg can convert INT8 into OID implicitly, it seems there > > would not be any problems. > > This has nothing to do with implicit or explicit casts. Um, I think the OP is right. Notice he does: create view v1 as select coalesce(c1,c2) from test1; which PG interprets as: SELECT COALESCE(test1.c1, test1.c2::oid) AS "coalesce" FROM test1; showing that PG is auto-magically inserting a cast from BIGINT to OID. The OP is saying that this isn't right because the cast isn't a total function, i.e. it fails for -1 and a large number of other inputs. I think the OP is either expecting the CREATE VIEW to fail saying types are invalid, or to result in "c1" being cast to BIGINT. -- Sam http://samason.me.uk/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
