Hi Peter,
>> Another possibility is
>> foo->bar(baz)
>> This is in the SQL standard under<attribute or method reference>, but
>> it requires the left side to be of a reference type, which is something
>> that we don't have.
I think this is the point where I stopped my efforts in the past -- I
guessed that a reference, in PostgreSQL relational algebra, could be a
pair of a pg_class oid together with the object's oid (having to query
the pg_class oid each time seemed very expensive to me, then). I fiddled
around with a little C programming, then I lost confidence in whether I
was doing something reasonable -- I was afraid I did not know enough
about the internals to predict a convincing outcome.
All the best,
Nick