list_fields (Mysql)

    # File lib/active_record/vendor/mysql.rb, line 284
      def list_fields(table, field=nil)
        command COM_FIELD_LIST, "#{table}\0#{field}", true
        if @pre_411
          f = read_rows 6
        else
          f = read_rows 7
        end
        fields = unpack_fields(f, @server_capabilities & CLIENT_LONG_FLAG != 0)
        res = Result::new self, fields, f.length
        res.eof = true
        res
      end