vortex_array/arrays/varbin/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::VarBinArray;
10use crate::arrays::VarBinVTable;
11use crate::compute::CastKernel;
12use crate::compute::CastKernelAdapter;
13use crate::register_kernel;
14use crate::vtable::ValidityHelper;
15
16impl CastKernel for VarBinVTable {
17    fn cast(&self, array: &VarBinArray, dtype: &DType) -> VortexResult<Option<ArrayRef>> {
18        if !array.dtype().eq_ignore_nullability(dtype) {
19            return Ok(None);
20        }
21
22        let new_nullability = dtype.nullability();
23        let new_validity = array
24            .validity()
25            .clone()
26            .cast_nullability(new_nullability, array.len())?;
27        let new_dtype = array.dtype().with_nullability(new_nullability);
28        Ok(Some(
29            VarBinArray::try_new(
30                array.offsets().clone(),
31                array.bytes().clone(),
32                new_dtype,
33                new_validity,
34            )?
35            .into_array(),
36        ))
37    }
38}
39
40register_kernel!(CastKernelAdapter(VarBinVTable).lift());
41
42#[cfg(test)]
43mod tests {
44    use rstest::rstest;
45    use vortex_dtype::DType;
46    use vortex_dtype::Nullability;
47
48    use crate::arrays::VarBinArray;
49    use crate::compute::cast;
50    use crate::compute::conformance::cast::test_cast_conformance;
51
52    #[rstest]
53    #[case(
54        DType::Utf8(Nullability::Nullable),
55        DType::Utf8(Nullability::NonNullable)
56    )]
57    #[case(
58        DType::Binary(Nullability::Nullable),
59        DType::Binary(Nullability::NonNullable)
60    )]
61    #[case(
62        DType::Utf8(Nullability::NonNullable),
63        DType::Utf8(Nullability::Nullable)
64    )]
65    #[case(
66        DType::Binary(Nullability::NonNullable),
67        DType::Binary(Nullability::Nullable)
68    )]
69    fn try_cast_varbin_nullable(#[case] source: DType, #[case] target: DType) {
70        let varbin = VarBinArray::from_iter(vec![Some("a"), Some("b"), Some("c")], source);
71
72        let res = cast(varbin.as_ref(), &target);
73        assert_eq!(res.unwrap().dtype(), &target);
74    }
75
76    #[rstest]
77    #[should_panic]
78    #[case(DType::Utf8(Nullability::Nullable))]
79    #[should_panic]
80    #[case(DType::Binary(Nullability::Nullable))]
81    fn try_cast_varbin_fail(#[case] source: DType) {
82        let non_nullable_source = source.as_nonnullable();
83        let varbin = VarBinArray::from_iter(vec![Some("a"), Some("b"), None], source);
84        cast(varbin.as_ref(), &non_nullable_source).unwrap();
85    }
86
87    #[rstest]
88    #[case(VarBinArray::from_iter(vec![Some("hello"), Some("world"), Some("test")], DType::Utf8(Nullability::NonNullable)))]
89    #[case(VarBinArray::from_iter(vec![Some("hello"), None, Some("world")], DType::Utf8(Nullability::Nullable)))]
90    #[case(VarBinArray::from_iter(vec![Some(b"binary".as_slice()), Some(b"data".as_slice())], DType::Binary(Nullability::NonNullable)))]
91    #[case(VarBinArray::from_iter(vec![Some(b"test".as_slice()), None], DType::Binary(Nullability::Nullable)))]
92    #[case(VarBinArray::from_iter(vec![Some("single")], DType::Utf8(Nullability::NonNullable)))]
93    fn test_cast_varbin_conformance(#[case] array: VarBinArray) {
94        test_cast_conformance(array.as_ref());
95    }
96}
vortex_array/arrays/varbin/compute/cast.rs

vortex_array/arrays/varbin/compute/
cast.rs
