final QueryResult opp = process(queryResult, operandID);
final RuleResult rr = (RuleResult) opp;
if (opp == null)
return;
if (this.succeedingOperators.size() > 1) {
opp.materialize();
}
for (final OperatorIDTuple opId : this.succeedingOperators) {
((DebugStepRIF)debugstep).step(this, opId.getOperator(), rr);
final QueryResultDebug qrDebug = new QueryResultDebug(opp,
debugstep, this, opId.getOperator(), true);