Method next

sql/sql_join_cache.cc:3527–3563

*/

int JOIN_TAB_SCAN::next()
{
  int err= 0;
  int skip_rc;
  READ_RECORD *info= &join_tab->read_record;
  SQL_SELECT *select= join_tab->cache_select;
  THD *thd= join->thd;

  if (is_first_record)
    is_first_record= FALSE;
  else
    err= info->read_record();

  if (!err)
  {
    join_tab->tracker->r_rows++;
  }

  while (!err && select && (skip_rc= select->skip_record(thd)) <= 0)
  {
    if (unlikely(thd->check_killed()) || skip_rc < 0)
      return 1;
    /* 
      Move to the next record if the last retrieved record does not
      meet the condition pushed to the table join_tab.
    */
    err= info->read_record();
    if (!err)
    {
      join_tab->tracker->r_rows++;
    }
  }

  if (!err)
    join_tab->tracker->r_rows_after_where++;
  return err; 
}


/*