Function val_str

sql/item_sum.h:1085–1085

  longlong val_int() {return 0;}
  my_decimal *val_decimal(my_decimal *decimal_value) {return NULL;}
  String* val_str(String* str) {return NULL;}
  virtual void print(String *str, enum_query_type query_type);
  virtual bool change_context_processor(uchar *cntx)
    { context= (Name_resolution_context *)cntx; return FALSE; }