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