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vortex_array/arrays/list/vtable/
visitor.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use crate::ArrayBufferVisitor;
5use crate::ArrayChildVisitor;
6use crate::ArrayRef;
7use crate::arrays::ListArray;
8use crate::arrays::ListVTable;
9use crate::vtable::ValidityHelper;
10use crate::vtable::VisitorVTable;
11use crate::vtable::validity_nchildren;
12use crate::vtable::validity_to_child;
13
14impl VisitorVTable<ListVTable> for ListVTable {
15    fn visit_buffers(_array: &ListArray, _visitor: &mut dyn ArrayBufferVisitor) {}
16
17    fn nbuffers(_array: &ListArray) -> usize {
18        0
19    }
20
21    fn visit_children(array: &ListArray, visitor: &mut dyn ArrayChildVisitor) {
22        visitor.visit_child("elements", array.elements());
23        visitor.visit_child("offsets", array.offsets());
24        visitor.visit_validity(array.validity(), array.len());
25    }
26
27    fn nchildren(array: &ListArray) -> usize {
28        2 + validity_nchildren(array.validity())
29    }
30
31    fn nth_child(array: &ListArray, idx: usize) -> Option<ArrayRef> {
32        match idx {
33            0 => Some(array.elements().clone()),
34            1 => Some(array.offsets().clone()),
35            2 => validity_to_child(array.validity(), array.len()),
36            _ => None,
37        }
38    }
39}