vortex_array/arrays/chunked/compute/
cast.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use vortex_dtype::DType;
5use vortex_error::VortexResult;
6
7use crate::ArrayRef;
8use crate::IntoArray;
9use crate::arrays::ChunkedArray;
10use crate::arrays::ChunkedVTable;
11use crate::builtins::ArrayBuiltins;
12use crate::compute::CastReduce;
13
14impl CastReduce for ChunkedVTable {
15    fn cast(array: &ChunkedArray, dtype: &DType) -> VortexResult<Option<ArrayRef>> {
16        let mut cast_chunks = Vec::new();
17        for chunk in array.chunks() {
18            cast_chunks.push(chunk.cast(dtype.clone())?);
19        }
20
21        // SAFETY: casting all chunks retains all chunks have same DType
22        unsafe {
23            Ok(Some(
24                ChunkedArray::new_unchecked(cast_chunks, dtype.clone()).into_array(),
25            ))
26        }
27    }
28}
29
30#[cfg(test)]
31mod test {
32    use rstest::rstest;
33    use vortex_buffer::buffer;
34    use vortex_dtype::DType;
35    use vortex_dtype::Nullability;
36    use vortex_dtype::PType;
37
38    use crate::IntoArray;
39    use crate::arrays::PrimitiveArray;
40    use crate::arrays::chunked::ChunkedArray;
41    use crate::assert_arrays_eq;
42    use crate::builtins::ArrayBuiltins;
43    use crate::compute::conformance::cast::test_cast_conformance;
44
45    #[test]
46    fn test_cast_chunked() {
47        let arr0 = buffer![0u32, 1].into_array();
48        let arr1 = buffer![2u32, 3].into_array();
49
50        let chunked = ChunkedArray::try_new(
51            vec![arr0, arr1],
52            DType::Primitive(PType::U32, Nullability::NonNullable),
53        )
54        .unwrap()
55        .into_array();
56
57        // Two levels of chunking, just to be fancy.
58        let root = ChunkedArray::try_new(
59            vec![chunked],
60            DType::Primitive(PType::U32, Nullability::NonNullable),
61        )
62        .unwrap()
63        .into_array();
64
65        let result = root
66            .cast(DType::Primitive(PType::U64, Nullability::NonNullable))
67            .unwrap();
68        assert_arrays_eq!(result, PrimitiveArray::from_iter([0u64, 1, 2, 3]));
69    }
70
71    #[rstest]
72    #[case(ChunkedArray::try_new(
73        vec![buffer![0u32, 1, 2].into_array(), buffer![3u32, 4].into_array()],
74        DType::Primitive(PType::U32, Nullability::NonNullable)
75    ).unwrap().into_array())]
76    #[case(ChunkedArray::try_new(
77        vec![
78            buffer![-10i32, -5, 0].into_array(),
79            buffer![5i32, 10].into_array()
80        ],
81        DType::Primitive(PType::I32, Nullability::NonNullable)
82    ).unwrap().into_array())]
83    #[case(ChunkedArray::try_new(
84        vec![
85            PrimitiveArray::from_option_iter([Some(1.5f32), None, Some(2.5)]).into_array(),
86            PrimitiveArray::from_option_iter([Some(3.5f32), Some(4.5)]).into_array()
87        ],
88        DType::Primitive(PType::F32, Nullability::Nullable)
89    ).unwrap().into_array())]
90    #[case(ChunkedArray::try_new(
91        vec![buffer![42u8].into_array()],
92        DType::Primitive(PType::U8, Nullability::NonNullable)
93    ).unwrap().into_array())]
94    fn test_cast_chunked_conformance(#[case] array: crate::ArrayRef) {
95        test_cast_conformance(array.as_ref());
96    }
97}
vortex_array/arrays/chunked/compute/cast.rs

vortex_array/arrays/chunked/compute/
cast.rs
