Method set_value

sql/item_func.cc:1654–1659

void Item_user_var_as_out_param::set_value(const char *str, uint length,
                                           const CHARSET_INFO* cs)
{
  entry->store((void*) str, length, STRING_RESULT, cs,
               DERIVATION_IMPLICIT, 0 /* unsigned_arg */);
}


double Item_user_var_as_out_param::val_real()