arrow2 0.18.0

Unofficial implementation of Apache Arrow spec in safe Rust
Documentation 
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use arrow2::{array::*, bitmap::Bitmap, buffer::Buffer, datatypes::DataType};

#[test]
fn basics() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(4), None, Some(6)]),
    ];

    let mut array = MutableListArray::<i32, MutablePrimitiveArray<i32>>::new();
    array.try_extend(data).unwrap();
    let array: ListArray<i32> = array.into();

    let values = PrimitiveArray::<i32>::new(
        DataType::Int32,
        Buffer::from(vec![1, 2, 3, 4, 0, 6]),
        Some(Bitmap::from([true, true, true, true, false, true])),
    );

    let data_type = ListArray::<i32>::default_datatype(DataType::Int32);
    let expected = ListArray::<i32>::new(
        data_type,
        vec![0, 3, 3, 6].try_into().unwrap(),
        Box::new(values),
        Some(Bitmap::from([true, false, true])),
    );
    assert_eq!(expected, array);
}

#[test]
fn with_capacity() {
    let array = MutableListArray::<i32, MutablePrimitiveArray<i32>>::with_capacity(10);
    assert!(array.offsets().capacity() >= 10);
    assert_eq!(array.offsets().len_proxy(), 0);
    assert_eq!(array.values().values().capacity(), 0);
    assert_eq!(array.validity(), None);
}

#[test]
fn push() {
    let mut array = MutableListArray::<i32, MutablePrimitiveArray<i32>>::new();
    array
        .try_push(Some(vec![Some(1i32), Some(2), Some(3)]))
        .unwrap();
    assert_eq!(array.len(), 1);
    assert_eq!(array.values().values().as_ref(), [1, 2, 3]);
    assert_eq!(array.offsets().as_slice(), [0, 3]);
    assert_eq!(array.validity(), None);
}

#[test]
fn extend_from_self() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(4), None, Some(6)]),
    ];
    let mut a = MutableListArray::<i32, MutablePrimitiveArray<i32>>::new();
    a.try_extend(data.clone()).unwrap();

    a.try_extend_from_self(&a.clone()).unwrap();
    let a: ListArray<i32> = a.into();

    let mut expected = data.clone();
    expected.extend(data);

    let mut b = MutableListArray::<i32, MutablePrimitiveArray<i32>>::new();
    b.try_extend(expected).unwrap();
    let b: ListArray<i32> = b.into();

    assert_eq!(a, b);
}