estimator.costOperator(node); prunePlanAlternatives(outputPlans);
estimator.costOperator(node); prunePlanAlternatives(outputPlans);
estimator.costOperator(node); prunePlanAlternatives(outputPlans);
estimator.costOperator(node); prunePlanAlternatives(outputPlans);
estimator.costOperator(node); prunePlanAlternatives(outputPlans);