presto-main/src/main/java/io/prestosql/operator/LimitOperator.java/LimitOperatorFactory/createOperator
class LimitOperatorFactory:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, LimitOperator.class.getSimpleName());
            return new LimitOperator(operatorContext, limit);
        }