Method move_to

sql/sql_window.cc:908–919

  }

  void move_to(ha_rows row_number)
  {
    if (io_cache)
    {
      rownum= row_number;
    }
    else
    {
      cache_pos= MY_MIN(cache_end, cache_start + row_number * ref_length);
      DBUG_ASSERT(cache_pos <= cache_end);
    }
  }

protected:
  bool at_eof()