Please apply the patch at the end. Disables use of system

Please apply the patch at the end. Disables use of system
    columns of views at all (not only oid, cmin etc. too).
    pgsql=> select cmin from pg_rules;
    ERROR:  system column cmin not available - pg_rules is a view
    pgsql=> select * from pg_rules where pg_rules.oid = pg_class.oid;
    ERROR:  system column oid not available - pg_rules is a view
    pgsql=>

Jan