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vortex_array/arrays/listview/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::ListView;
10use crate::arrays::listview::vtable::ListViewArray;
11use crate::scalar::Scalar;
12use crate::vtable::OperationsVTable;
13
14impl OperationsVTable<ListView> for ListView {
15    fn scalar_at(
16        array: &ListViewArray,
17        index: usize,
18        _ctx: &mut ExecutionCtx,
19    ) -> VortexResult<Scalar> {
20        // By the preconditions we know that the list scalar is not null.
21        let list = array.list_elements_at(index)?;
22        let children: Vec<Scalar> = (0..list.len())
23            .map(|i| list.scalar_at(i))
24            .collect::<VortexResult<_>>()?;
25
26        Ok(Scalar::list(
27            Arc::new(list.dtype().clone()),
28            children,
29            array.dtype.nullability(),
30        ))
31    }
32}