FDW table hints

postgres=# DROP TABLE FOO;
ERROR:  "foo" is not a table
HINT:  Use DROP FOREIGN TABLE to remove a foreign table.
postgres=# CREATE INDEX baz ON foo(bar);
ERROR:  "foo" is not a table

To some, that would be confusing - foo kind of is a table, just a
different kind. Should we have some HINT on that one as well?

-- 
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/