columnar 0.13.1

Conversion from arrays of complex structs to simple structs of arrays
Documentation 
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use bencher::{benchmark_group, benchmark_main, Bencher};
use columnar::{Clear, Columnar};
use columnar::bytes::indexed;

fn empty_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![(); 1024]); }
fn option_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![Option::<String>::None; 1024]); }
fn u64_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![0u64; 1024]); }
fn u32x2_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![(0u32,0u32); 1024]); }
fn u8_u64_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![(0u8, 0u64); 512]); }
fn string10_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![format!("grawwwwrr!"); 1024]); }
fn string20_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![format!("grawwwwrr!!!!!!!!!!!"); 512]); }
fn vec_u_s_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![vec![(0u64, format!("grawwwwrr!")); 32]; 32]); }
fn vec_u_vn_s_copy(bencher: &mut Bencher) { _bench_copy(bencher, vec![vec![(0u64, vec![(); 1 << 40], format!("grawwwwrr!")); 32]; 32]); }

fn empty_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![(); 1024]); }
fn option_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![Option::<String>::None; 1024]); }
fn u64_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![0u64; 1024]); }
fn u32x2_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![(0u32,0u32); 1024]); }
fn u8_u64_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![(0u8, 0u64); 512]); }
fn string10_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![format!("grawwwwrr!"); 1024]); }
fn string20_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![format!("grawwwwrr!!!!!!!!!!!"); 512]); }
fn vec_u_s_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![vec![(0u64, format!("grawwwwrr!")); 32]; 32]); }
fn vec_u_vn_s_extend(bencher: &mut Bencher) { _bench_extend(bencher, vec![vec![(0u64, vec![(); 1 << 40], format!("grawwwwrr!")); 32]; 32]); }

fn empty_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![(); 1024]); }
fn option_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![Option::<String>::None; 1024]); }
fn u64_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![0u64; 1024]); }
fn u32x2_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![(0u32,0u32); 1024]); }
fn u8_u64_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![(0u8, 0u64); 512]); }
fn string10_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![format!("grawwwwrr!"); 1024]); }
fn string20_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![format!("grawwwwrr!!!!!!!!!!!"); 512]); }
fn vec_u_s_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![vec![(0u64, format!("grawwwwrr!")); 32]; 32]); }
fn vec_u_vn_s_clone(bencher: &mut Bencher) { _bench_clone(bencher, vec![vec![(0u64, vec![(); 1 << 40], format!("grawwwwrr!")); 32]; 32]); }

// #[bench] fn empty_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![(); 1024]); }
// #[bench] fn u64_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![0u64; 1024]); }
// #[bench] fn u32x2_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![(0u32,0u32); 1024]); }
// #[bench] fn u8_u64_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![(0u8, 0u64); 512]); }
// #[bench] fn string10_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![format!("grawwwwrr!"); 1024]); }
// #[bench] fn string20_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![format!("grawwwwrr!!!!!!!!!!!"); 512]); }
// #[bench] fn vec_u_s_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![vec![(0u64, format!("grawwwwrr!")); 32]; 32]); }
// #[bench] fn vec_u_vn_s_realloc(bencher: &mut Bencher) { _bench_realloc(bencher, vec![vec![(0u64, vec![(); 1 << 40], format!("grawwwwrr!")); 32]; 32]); }

// #[bench] fn empty_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![(); 1024]); }
// #[bench] fn u64_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![0u64; 1024]); }
// #[bench] fn u32x2_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![(0u32,0u32); 1024]); }
// #[bench] fn u8_u64_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![(0u8, 0u64); 512]); }
// #[bench] fn string10_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![format!("grawwwwrr!"); 1024]); }
// #[bench] fn string20_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![format!("grawwwwrr!!!!!!!!!!!"); 512]); }
// #[bench] fn vec_u_s_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![vec![(0u64, format!("grawwwwrr!")); 32]; 32]); }
// #[bench] fn vec_u_vn_s_prealloc(bencher: &mut Bencher) { _bench_prealloc(bencher, vec![vec![(0u64, vec![(); 1 << 40], format!("grawwwwrr!")); 32]; 32]); }

fn _bench_copy<T: Columnar+Eq>(bencher: &mut Bencher, record: T) where T::Container : for<'a> columnar::Push<&'a T> {
    use columnar::Push;

    // prepare encoded data for bencher.bytes
    let mut arena: T::Container = Default::default();

    // get sizing information for throughput reports.
    for _ in 0 .. 1024 {
        arena.push(&record);
    }
    use columnar::Borrow;
    bencher.bytes = indexed::length_in_bytes(&arena.borrow()) as u64;
    arena.clear();

    bencher.iter(|| {
        arena.clear();
        for _ in 0 .. 1024 {
            arena.push(&record);
        }
    });
}

fn _bench_extend<T: Columnar+Eq>(bencher: &mut Bencher, record: T) where T::Container : for<'a> columnar::Push<&'a T> {
    use columnar::Push;

    // prepare encoded data for bencher.bytes
    let mut arena: T::Container = Default::default();

    // get sizing information for throughput reports.
    for _ in 0 .. 1024 {
        arena.push(&record);
    }
    use columnar::{Borrow, Container};
    bencher.bytes = indexed::length_in_bytes(&arena.borrow()) as u64;

    let arena2 = arena.clone();
    
    bencher.iter(|| {
        arena.clear();
        for i in 0 .. 1024 {
            arena.extend_from_self(arena2.borrow(), i .. i+1)
        }
    });
}

fn _bench_clone<T: Columnar+Eq+Clone>(bencher: &mut Bencher, record: T) {

    // prepare encoded data for bencher.bytes
    let mut arena = Vec::new();

    bencher.iter(|| {
        arena.clear();
        for _ in 0 .. 1024 {
            arena.push(record.clone());
        }
    });
}

// fn _bench_realloc<T: Columnar+Eq>(bencher: &mut Bencher, record: T) {

//     bencher.iter(|| {
//         // prepare encoded data for bencher.bytes
//         let mut arena: T::Columns = Default::default();

//         for _ in 0 .. 1024 {
//             arena.copy(&record);
//         }
//     });
// }

// fn _bench_prealloc<T: Columnar+Eq>(bencher: &mut Bencher, record: T) {

//     bencher.iter(|| {
//         // prepare encoded data for bencher.bytes
//         let mut arena: T::Columns = Default::default();

//         for _ in 0 .. 1024 {
//             arena.copy(&record);
//         }
//     });
// }

benchmark_group!(
    clone,
    empty_clone,
    option_clone,
    string10_clone,
    string20_clone,
    u32x2_clone,
    u64_clone,
    u8_u64_clone,
    vec_u_s_clone,
    vec_u_vn_s_clone,
);
benchmark_group!(
    extend,
    empty_extend,
    option_extend,
    string10_extend,
    string20_extend,
    u32x2_extend,
    u64_extend,
    u8_u64_extend,
    vec_u_s_extend,
    vec_u_vn_s_extend,
);
benchmark_group!(
    copy,
    empty_copy,
    option_copy,
    string10_copy,
    string20_copy,
    u32x2_copy,
    u64_copy,
    u8_u64_copy,
    vec_u_s_copy,
    vec_u_vn_s_copy,
);
benchmark_main!(clone, copy, extend);