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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::ExecutionCtx;
9use crate::arrays::List;
10use crate::arrays::list::vtable::ListArray;
11use crate::scalar::Scalar;
12use crate::vtable::OperationsVTable;
13
14impl OperationsVTable<List> for List {
15    fn scalar_at(array: &ListArray, index: usize, _ctx: &mut ExecutionCtx) -> VortexResult<Scalar> {
16        // By the preconditions we know that the list scalar is not null.
17        let elems = array.list_elements_at(index)?;
18        let scalars: Vec<Scalar> = (0..elems.len())
19            .map(|i| elems.scalar_at(i))
20            .collect::<VortexResult<_>>()?;
21
22        Ok(Scalar::list(
23            Arc::new(elems.dtype().clone()),
24            scalars,
25            array.dtype().nullability(),
26        ))
27    }
28}