Function use_found_constraint

sql/sql_select.cc:8334–8338

Take into account that the table's WHERE clause has conditions on earlier tables that can reduce the number of accepted rows. @param records Number of original rows (after selectivity) If there is a filtering condition on the table (i.e. ref analyzer found at least one "table.keyXpartY= exprZ", where exprZ refers only to tables preceding this table in the join order we're now consider

  this table in join order.
*/
inline double use_found_constraint(double records)
{
  records-= records/4;
  return records ? MY_MAX(records, MIN_ROWS_AFTER_FILTERING) : 0.0;
}


/*