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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use vortex_dtype::{DType, Nullability};
use vortex_error::{vortex_err, VortexResult};
use vortex_scalar::Scalar;

use crate::array::chunked::ChunkedArray;
use crate::compute::unary::{
    scalar_at, scalar_at_unchecked, try_cast, CastFn, ScalarAtFn, SubtractScalarFn,
};
use crate::compute::{compare, slice, ArrayCompute, CompareFn, Operator, SliceFn, TakeFn};
use crate::{Array, IntoArray};

mod slice;
mod take;

impl ArrayCompute for ChunkedArray {
    fn cast(&self) -> Option<&dyn CastFn> {
        Some(self)
    }

    fn compare(&self) -> Option<&dyn CompareFn> {
        Some(self)
    }

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

    fn subtract_scalar(&self) -> Option<&dyn SubtractScalarFn> {
        Some(self)
    }

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

    fn take(&self) -> Option<&dyn TakeFn> {
        Some(self)
    }
}

impl ScalarAtFn for ChunkedArray {
    fn scalar_at(&self, index: usize) -> VortexResult<Scalar> {
        let (chunk_index, chunk_offset) = self.find_chunk_idx(index);
        scalar_at(
            &self
                .chunk(chunk_index)
                .ok_or_else(|| vortex_err!(OutOfBounds: chunk_index, 0, self.nchunks()))?,
            chunk_offset,
        )
    }

    fn scalar_at_unchecked(&self, index: usize) -> Scalar {
        let (chunk_index, chunk_offset) = self.find_chunk_idx(index);
        scalar_at_unchecked(&self.chunk(chunk_index).unwrap(), chunk_offset)
    }
}

impl CastFn for ChunkedArray {
    fn cast(&self, dtype: &DType) -> VortexResult<Array> {
        let mut cast_chunks = Vec::new();
        for chunk in self.chunks() {
            cast_chunks.push(try_cast(&chunk, dtype)?);
        }

        Ok(ChunkedArray::try_new(cast_chunks, dtype.clone())?.into_array())
    }
}

impl CompareFn for ChunkedArray {
    fn compare(&self, array: &Array, operator: Operator) -> VortexResult<Array> {
        let mut idx = 0;
        let mut compare_chunks = Vec::with_capacity(self.nchunks());

        for chunk in self.chunks() {
            let sliced = slice(array, idx, idx + chunk.len())?;
            let cmp_result = compare(&chunk, &sliced, operator)?;
            compare_chunks.push(cmp_result);

            idx += chunk.len();
        }

        Ok(ChunkedArray::try_new(compare_chunks, DType::Bool(Nullability::Nullable))?.into_array())
    }
}

#[cfg(test)]
mod test {
    use vortex_dtype::{DType, Nullability, PType};

    use crate::array::chunked::ChunkedArray;
    use crate::array::primitive::PrimitiveArray;
    use crate::compute::unary::try_cast;
    use crate::validity::Validity;
    use crate::{IntoArray, IntoArrayVariant};

    #[test]
    fn test_cast_chunked() {
        let arr0 = PrimitiveArray::from_vec(vec![0u32, 1], Validity::NonNullable).into_array();
        let arr1 = PrimitiveArray::from_vec(vec![2u32, 3], Validity::NonNullable).into_array();

        let chunked = ChunkedArray::try_new(
            vec![arr0, arr1],
            DType::Primitive(PType::U32, Nullability::NonNullable),
        )
        .unwrap()
        .into_array();

        // Two levels of chunking, just to be fancy.
        let root = ChunkedArray::try_new(
            vec![chunked],
            DType::Primitive(PType::U32, Nullability::NonNullable),
        )
        .unwrap()
        .into_array();

        assert_eq!(
            try_cast(
                &root,
                &DType::Primitive(PType::U64, Nullability::NonNullable)
            )
            .unwrap()
            .into_primitive()
            .unwrap()
            .into_maybe_null_slice::<u64>(),
            vec![0u64, 1, 2, 3],
        );
    }
}