Optimize is_distinct_from / is_not_distinct_from

[Dandandan]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Currently is_distinct_from and is_not_disctinct_from is written in an unoptimized way:

left
        .iter()
        .zip(right.iter())
        .map(|(x, y)| Some(x != y))
        .collect()

Describe the solution you'd like
Write a faster kernel.

Describe alternatives you've considered

Additional context

[comphead]

@Dandandan may I try this?

test to reproduce

    #[test]
    fn bench_is_distinct_from() {
        let max = 1_000_000_000;
        let l_array: &[Option<i128>] = &(0 .. max).map(|v| Some(v)).collect::<Vec<Option<i128>>>();
        let r_array: &[Option<i128>] = &(0 .. max).map(|v| Some(v+1)).collect::<Vec<Option<i128>>>();
        println!("Elapsed: {:.2?}", elapsed);

        let left_array = create_decimal_array(l_array, 10, 1);
        let right_array = create_decimal_array(r_array, 1, 1);

        use std::time::Instant;
        let now = Instant::now();
        is_distinct_from(&left_array, &right_array);
        let elapsed = now.elapsed();
        println!("Elapsed: {:.2?}", elapsed);
    }

1_000_000_000 -> Elapsed: 174.09s Cant say for mem usage for now.
I'll update on rewrite results.

[Dandandan]

@Dandandan may I try this?

test to reproduce

    #[test]
    fn bench_is_distinct_from() {
        let max = 1_000_000_000;
        let l_array: &[Option<i128>] = &(0 .. max).map(|v| Some(v)).collect::<Vec<Option<i128>>>();
        let r_array: &[Option<i128>] = &(0 .. max).map(|v| Some(v+1)).collect::<Vec<Option<i128>>>();
        println!("Elapsed: {:.2?}", elapsed);

        let left_array = create_decimal_array(l_array, 10, 1);
        let right_array = create_decimal_array(r_array, 1, 1);

        use std::time::Instant;
        let now = Instant::now();
        is_distinct_from(&left_array, &right_array);
        let elapsed = now.elapsed();
        println!("Elapsed: {:.2?}", elapsed);
    }

1_000_000_000 -> Elapsed: 174.09s Cant say for mem usage for now. I'll update on rewrite results.

Sure, that would be awesome 😎