# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 524
      def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
        # Extract the table from the insert sql. Yuck.
        _, table = extract_schema_and_table(sql.split(" ", 4)[2])

        pk ||= primary_key(table)

        if pk
          select_value("#{sql} RETURNING #{quote_column_name(pk)}")
        else
          super
        end
      end