length_kernel.rs

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use criterion::{criterion_group, criterion_main, Criterion};

use arrow2::array::*;
use arrow2::compute::length::length;

fn bench_length(array: &Utf8Array<i32>) {
    criterion::black_box(length(array).unwrap());
}

fn add_benchmark(c: &mut Criterion) {
    fn double_vec<T: Clone>(v: Vec<T>) -> Vec<T> {
        [&v[..], &v[..]].concat()
    }

    // double ["hello", " ", "world", "!"] 10 times
    let mut values = vec!["one", "on", "o", ""];
    for _ in 0..10 {
        values = double_vec(values);
    }
    let array = Utf8Array::<i32>::from_slice(&values);

    c.bench_function("length", |b| b.iter(|| bench_length(&array)));
}

criterion_group!(benches, add_benchmark);
criterion_main!(benches);