instance method add_oid

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 775
        def add_oid(row, records_by_oid, type_map)
          return type_map if type_map.key? row['type_elem'].to_i

          if OID.registered_type? row['typname']
            # this composite type is explicitly registered
            vector = OID::NAMES[row['typname']]
          else
            # use the default for composite types
            unless type_map.key? row['typelem'].to_i
              add_oid records_by_oid[row['typelem']], records_by_oid, type_map
            end

            vector = OID::Vector.new row['typdelim'], type_map[row['typelem'].to_i]
          end

          type_map[row['oid'].to_i] = vector
          type_map
        end