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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::Dict;
8use crate::ExecutionCtx;
9use crate::array::ArrayView;
10use crate::array::OperationsVTable;
11use crate::arrays::dict::DictArraySlotsExt;
12use crate::scalar::Scalar;
13
14impl OperationsVTable<Dict> for Dict {
15    fn scalar_at(
16        array: ArrayView<'_, Dict>,
17        index: usize,
18        _ctx: &mut ExecutionCtx,
19    ) -> VortexResult<Scalar> {
20        let Some(dict_index) = array
21            .codes()
22            .scalar_at(index)?
23            .as_primitive()
24            .as_::<usize>()
25        else {
26            return Ok(Scalar::null(array.dtype().clone()));
27        };
28
29        Ok(array
30            .values()
31            .scalar_at(dict_index)?
32            .cast(array.dtype())
33            .vortex_expect("Array dtype will only differ by nullability"))
34    }
35}