presto-main/src/main/java/io/prestosql/operator/LimitOperator.java/LimitOperator/LimitOperatorFactory
class LimitOperator:        public LimitOperatorFactory(int operatorId, PlanNodeId planNodeId, long limit)
        {
            this.operatorId = operatorId;
            this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
            this.limit = limit;
        }