Function st_make_line 

pub fn st_make_line(a: &[u8], b: &[u8]) -> Result<Vec<u8>>

ST_MakeLine: build a LineString from two point geometries.

Example

use sqlitegis::core::functions::constructors::{st_point, st_make_line};
use sqlitegis::core::functions::accessors::st_num_points;

let a = st_point(0.0, 0.0, None).unwrap();
let b = st_point(1.0, 1.0, None).unwrap();
let line = st_make_line(&a, &b).unwrap();
assert_eq!(st_num_points(&line).unwrap(), 2);