vortex-array 0.62.0

Vortex in memory columnar data format
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright the Vortex contributors

use vortex_error::VortexResult;
use vortex_mask::Mask;

use crate::arrays::PrimitiveArray;
use crate::arrays::PrimitiveVTable;
use crate::compute::NaNCountKernel;
use crate::compute::NaNCountKernelAdapter;
use crate::dtype::NativePType;
use crate::match_each_float_ptype;
use crate::register_kernel;

impl NaNCountKernel for PrimitiveVTable {
    fn nan_count(&self, array: &PrimitiveArray) -> VortexResult<usize> {
        Ok(match_each_float_ptype!(array.ptype(), |F| {
            compute_nan_count_with_validity(array.as_slice::<F>(), array.validity_mask()?)
        }))
    }
}

register_kernel!(NaNCountKernelAdapter(PrimitiveVTable).lift());

#[inline]
fn compute_nan_count_with_validity<T: NativePType>(values: &[T], validity: Mask) -> usize {
    match validity {
        Mask::AllTrue(_) => values.iter().filter(|v| v.is_nan()).count(),
        Mask::AllFalse(_) => 0,
        Mask::Values(v) => values
            .iter()
            .zip(v.bit_buffer().iter())
            .filter_map(|(v, m)| m.then_some(v))
            .filter(|v| v.is_nan())
            .count(),
    }
}

#[cfg(test)]
mod tests {
    use vortex_buffer::buffer;

    use crate::IntoArray;
    use crate::arrays::PrimitiveArray;
    use crate::compute::nan_count;
    use crate::validity::Validity;

    #[test]
    fn primitive_nan_count() {
        let p = PrimitiveArray::new(
            buffer![
                -f32::NAN,
                f32::NAN,
                0.1,
                1.1,
                -0.0,
                f32::INFINITY,
                f32::NEG_INFINITY
            ],
            Validity::NonNullable,
        );
        assert_eq!(nan_count(&p.into_array()).unwrap(), 2);
    }
}