On Tue, Nov 17, 2009 at 1:35 AM, Adam Rich <adam.r@xxxxxxxxxxxxx> wrote: > Merlin Moncure wrote: >> >> On Tue, Nov 17, 2009 at 1:02 AM, Adam Rich <adam.r@xxxxxxxxxxxxx> wrote: >>> >>> Hello, >>> There is an existing function which takes an integer and returns a >>> record. >>> I need to call this function with every integer in a table. Is there a >>> simple shortcut for doing this? >>> >>> I'm looking for something like: >>> >>> select f.* >>> from function(t.value) f, table t >> >> select (f).* from (select function(t.value) as f from table t) q; >> >> merlin >> > > Thanks, that's perfect, and much faster than the one I came up with in the > interim: > > select (f(t.value)).* from table t; Your version is basically correct. It's slower because of a nasty gotcha that is stemming from the fact that ().* is not really an operator. It is expanded during parsing so that for each field of your type, the function is run, like this: select (f(t.value)).* from table t; select f(t.value).a, f(t.value).b, f(t.value).c from table t; I've griped about this a few times, but I don't know if it's fixable or even broken...it's just something you have to watch out for. merlin -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
