Method Item_empty_string

sql/item.h:2272–2278

{
public:
  Item_empty_string(const char *header, uint length,
                    const CHARSET_INFO *cs= NULL) :
    Item_partition_func_safe_string(Name_string(header, strlen(header)),
                                    0, cs ? cs : &my_charset_utf8_general_ci)
    {
      max_length= length * collation.collation->mbmaxlen;
    }
};