Method val_str_ascii

sql/item.cc:99–117

For the items which don't have its own fast val_str_ascii() implementation we provide a generic slower version, which converts from the Item character set to ASCII. For better performance conversion happens only in case of a "tricky" Item character set (e.g. UCS2). Normally conversion does not happen. */

  Normally conversion does not happen.
*/
String *Item::val_str_ascii(String *str)
{
  if (!(collation.collation->state & MY_CS_NONASCII))
    return val_str(str);
  
  DBUG_ASSERT(str != &str_value);
  
  uint errors;
  String *res= val_str(&str_value);
  if (!res)
    return 0;
  
  if ((null_value= str->copy(res->ptr(), res->length(),
                             collation.collation, &my_charset_latin1,
                             &errors)))
    return 0;
  
  return str;
}


String *Item::val_string_from_real(String *str)