vortex_array/arrays/struct_/compute/
is_constant.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use vortex_error::VortexResult;
5
6use crate::arrays::StructArray;
7use crate::arrays::StructVTable;
8use crate::compute::IsConstantKernel;
9use crate::compute::IsConstantKernelAdapter;
10use crate::compute::IsConstantOpts;
11use crate::compute::{self};
12use crate::register_kernel;
13
14impl IsConstantKernel for StructVTable {
15    fn is_constant(
16        &self,
17        array: &StructArray,
18        opts: &IsConstantOpts,
19    ) -> VortexResult<Option<bool>> {
20        let children = array.children();
21        if children.is_empty() {
22            return Ok(Some(true));
23        }
24
25        for child in children.iter() {
26            match compute::is_constant_opts(child, opts)? {
27                // Un-determined
28                None => return Ok(None),
29                Some(false) => return Ok(Some(false)),
30                Some(true) => {}
31            }
32        }
33
34        Ok(Some(true))
35    }
36}
37
38register_kernel!(IsConstantKernelAdapter(StructVTable).lift());