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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94

use croaring::Bitmap;
use vortex_array::compute::{ComputeVTable, InvertFn, ScalarAtFn, SliceFn};
use vortex_array::{ArrayData, ArrayLen, IntoArrayData};
use vortex_error::VortexResult;
use vortex_scalar::Scalar;

use crate::{RoaringBoolArray, RoaringBoolEncoding};

impl ComputeVTable for RoaringBoolEncoding {
    fn invert_fn(&self) -> Option<&dyn InvertFn<ArrayData>> {
        Some(self)
    }

    fn scalar_at_fn(&self) -> Option<&dyn ScalarAtFn<ArrayData>> {
        Some(self)
    }

    fn slice_fn(&self) -> Option<&dyn SliceFn<ArrayData>> {
        Some(self)
    }
}

impl InvertFn<RoaringBoolArray> for RoaringBoolEncoding {
    fn invert(&self, array: &RoaringBoolArray) -> VortexResult<ArrayData> {
        RoaringBoolArray::try_new(array.bitmap().flip(0..(array.len() as u32)), array.len())
            .map(|a| a.into_array())
    }
}

impl ScalarAtFn<RoaringBoolArray> for RoaringBoolEncoding {
    fn scalar_at(&self, array: &RoaringBoolArray, index: usize) -> VortexResult<Scalar> {
        Ok(array.bitmap().contains(index as u32).into())
    }
}

impl SliceFn<RoaringBoolArray> for RoaringBoolEncoding {
    fn slice(
        &self,
        array: &RoaringBoolArray,
        start: usize,
        stop: usize,
    ) -> VortexResult<ArrayData> {
        let slice_bitmap = Bitmap::from_range(start as u32..stop as u32);
        let bitmap = array
            .bitmap()
            .and(&slice_bitmap)
            .add_offset(-(start as i64));

        RoaringBoolArray::try_new(bitmap, stop - start).map(IntoArrayData::into_array)
    }
}

#[cfg(test)]
mod tests {
    use vortex_array::array::BoolArray;
    use vortex_array::compute::{scalar_at, slice};
    use vortex_array::{IntoArrayData, IntoArrayVariant};
    use vortex_scalar::Scalar;

    use crate::RoaringBoolArray;

    #[test]
    #[cfg_attr(miri, ignore)]
    pub fn test_scalar_at() {
        let bool = BoolArray::from_iter([true, false, true, true]);
        let array = RoaringBoolArray::encode(bool.into_array()).unwrap();

        let truthy: Scalar = true.into();
        let falsy: Scalar = false.into();

        assert_eq!(scalar_at(&array, 0).unwrap(), truthy);
        assert_eq!(scalar_at(&array, 1).unwrap(), falsy);
        assert_eq!(scalar_at(&array, 2).unwrap(), truthy);
        assert_eq!(scalar_at(&array, 3).unwrap(), truthy);
    }

    #[test]
    #[cfg_attr(miri, ignore)]
    pub fn test_slice() {
        let bool = BoolArray::from_iter([true, false, true, true]);
        let array = RoaringBoolArray::encode(bool.into_array()).unwrap();
        let sliced = slice(&array, 1, 3).unwrap();

        assert_eq!(
            sliced
                .into_bool()
                .unwrap()
                .boolean_buffer()
                .iter()
                .collect::<Vec<_>>(),
            &[false, true]
        );
    }
}