message: Obj::add_int and Obj::get_list by column name
diff: @@ -200,6 +200,10 @@ public:
  Obj& set_null(ColKey col_key, bool is_default = false);
  Obj& add_int(ColKey col_key, int64_t value);
  + Obj& add_int(StringData col_name, int64_t value)
  + {
  + return add_int(get_column_key(col_name), value);
  + }
  template <typename U>
  Obj& set_list_values(ColKey col_key, const std::vector<U>& values);
  @@ -215,6 +219,12 @@ public:
  template <typename U>
  LstPtr<U> get_list_ptr(ColKey col_key);
  + template <typename U>
  + Lst<U> get_list(StringData col_name)
  + {
  + return get_list<U>(get_column_key(col_name));
  + }
  +
  LnkLst get_linklist(ColKey col_key);
  LnkLstPtr get_linklist_ptr(ColKey col_key);
  LnkLst get_linklist(StringData col_name);
  