Method avg

sql/sql_analyse.h:248–255

  String *get_min_arg(String *s) { s->set(min_arg,my_thd_charset); return s; }
  String *get_max_arg(String *s) { s->set(max_arg,my_thd_charset); return s; }
  String *avg(String *s, ha_rows rows)
  {
    if (!(rows - nulls))
      s->set_real((double) 0.0, 1,my_thd_charset);
    else
      s->set_real(((double) sum / (double) (rows - nulls)), DEC_IN_AVG,my_thd_charset);
    return s;
  }
  String *std(String *s, ha_rows rows)
  {
    double tmp = ulonglong2double(rows);