Method session_value_ptr

sql/sys_vars.h:1074–1078

  void global_save_default(THD *thd, set_var *var)
  { var->save_result.ulonglong_value= option.def_value; }
  uchar *session_value_ptr(THD *thd, LEX_STRING *base)
  {
    return (uchar*)set_to_string(thd, 0, session_var(thd, ulonglong),
                                 typelib.type_names);
  }
  uchar *global_value_ptr(THD *thd, LEX_STRING *base)
  {
    return (uchar*)set_to_string(thd, 0, global_var(ulonglong),