Skip to main content

vortex_array/arrays/dict/vtable/
operations.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use vortex_error::VortexExpect;
5use vortex_error::VortexResult;
6
7use super::DictVTable;
8use crate::Array;
9use crate::arrays::dict::DictArray;
10use crate::scalar::Scalar;
11use crate::vtable::OperationsVTable;
12
13impl OperationsVTable<DictVTable> for DictVTable {
14    fn scalar_at(array: &DictArray, index: usize) -> VortexResult<Scalar> {
15        let Some(dict_index) = array
16            .codes()
17            .scalar_at(index)?
18            .as_primitive()
19            .as_::<usize>()
20        else {
21            return Ok(Scalar::null(array.dtype().clone()));
22        };
23
24        Ok(array
25            .values()
26            .scalar_at(dict_index)?
27            .cast(array.dtype())
28            .vortex_expect("Array dtype will only differ by nullability"))
29    }
30}