** Factor the non-base-table predicates into the extra
** non-qualifier selectivity, since these will restrict the
** number of rows, but not the cost.
*/
extraNonQualifierSelectivity *=
currentJoinStrategy.nonBasePredicateSelectivity(this, predList);
/* Create the start and stop key arrays, and fill them in */
DataValueDescriptor[] startKeys;
DataValueDescriptor[] stopKeys;