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vortex_array/arrays/list/vtable/
operations.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use std::sync::Arc;
5
6use vortex_error::VortexResult;
7
8use crate::arrays::ListArray;
9use crate::arrays::ListVTable;
10use crate::scalar::Scalar;
11use crate::vtable::OperationsVTable;
12
13impl OperationsVTable<ListVTable> for ListVTable {
14    fn scalar_at(array: &ListArray, index: usize) -> VortexResult<Scalar> {
15        // By the preconditions we know that the list scalar is not null.
16        let elems = array.list_elements_at(index)?;
17        let scalars: Vec<Scalar> = (0..elems.len())
18            .map(|i| elems.scalar_at(i))
19            .collect::<VortexResult<_>>()?;
20
21        Ok(Scalar::list(
22            Arc::new(elems.dtype().clone()),
23            scalars,
24            array.dtype().nullability(),
25        ))
26    }
27}