arrow 0.18.0

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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
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// specific language governing permissions and limitations
// under the License.

#[macro_use]
extern crate criterion;
use criterion::Criterion;

extern crate arrow;

use arrow::array::*;
use arrow::compute::kernels::substring::substring;
use arrow::util::bench_util::*;

fn bench_substring(arr: &dyn Array, start: i64, length: Option<u64>) {
    substring(criterion::black_box(arr), start, length).unwrap();
}

fn add_benchmark(c: &mut Criterion) {
    let size = 65536;
    let val_len = 1000;

    let arr_string = create_string_array_with_len::<i32>(size, 0.0, val_len);
    let arr_fsb = create_fsb_array(size, 0.0, val_len);

    c.bench_function("substring utf8 (start = 0, length = None)", |b| {
        b.iter(|| bench_substring(&arr_string, 0, None))
    });

    c.bench_function("substring utf8 (start = 1, length = str_len - 1)", |b| {
        b.iter(|| bench_substring(&arr_string, 1, Some((val_len - 1) as u64)))
    });

    c.bench_function("substring fixed size binary array", |b| {
        b.iter(|| bench_substring(&arr_fsb, 1, Some((val_len - 1) as u64)))
    });
}

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