vortex_array/compute/
fill_null.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use std::sync::LazyLock;
5
6use arcref::ArcRef;
7use vortex_dtype::DType;
8use vortex_error::{VortexError, VortexResult, vortex_bail, vortex_err};
9use vortex_scalar::Scalar;
10
11use crate::compute::{ComputeFn, ComputeFnVTable, InvocationArgs, Kernel, Output, cast};
12use crate::vtable::VTable;
13use crate::{Array, ArrayRef, IntoArray};
14
15static FILL_NULL_FN: LazyLock<ComputeFn> = LazyLock::new(|| {
16    let compute = ComputeFn::new("fill_null".into(), ArcRef::new_ref(&FillNull));
17    for kernel in inventory::iter::<FillNullKernelRef> {
18        compute.register_kernel(kernel.0.clone());
19    }
20    compute
21});
22
23pub fn fill_null(array: &dyn Array, fill_value: &Scalar) -> VortexResult<ArrayRef> {
24    FILL_NULL_FN
25        .invoke(&InvocationArgs {
26            inputs: &[array.into(), fill_value.into()],
27            options: &(),
28        })?
29        .unwrap_array()
30}
31
32pub trait FillNullKernel: VTable {
33    fn fill_null(&self, array: &Self::Array, fill_value: &Scalar) -> VortexResult<ArrayRef>;
34}
35
36pub struct FillNullKernelRef(ArcRef<dyn Kernel>);
37inventory::collect!(FillNullKernelRef);
38
39#[derive(Debug)]
40pub struct FillNullKernelAdapter<V: VTable>(pub V);
41
42impl<V: VTable + FillNullKernel> FillNullKernelAdapter<V> {
43    pub const fn lift(&'static self) -> FillNullKernelRef {
44        FillNullKernelRef(ArcRef::new_ref(self))
45    }
46}
47
48impl<V: VTable + FillNullKernel> Kernel for FillNullKernelAdapter<V> {
49    fn invoke(&self, args: &InvocationArgs) -> VortexResult<Option<Output>> {
50        let inputs = FillNullArgs::try_from(args)?;
51        let Some(array) = inputs.array.as_opt::<V>() else {
52            return Ok(None);
53        };
54        Ok(Some(
55            V::fill_null(&self.0, array, inputs.fill_value)?.into(),
56        ))
57    }
58}
59
60struct FillNull;
61
62impl ComputeFnVTable for FillNull {
63    fn invoke(
64        &self,
65        args: &InvocationArgs,
66        kernels: &[ArcRef<dyn Kernel>],
67    ) -> VortexResult<Output> {
68        let FillNullArgs { array, fill_value } = FillNullArgs::try_from(args)?;
69
70        if !array.dtype().is_nullable() || array.all_valid() {
71            return Ok(cast(array, fill_value.dtype())?.into());
72        }
73
74        if fill_value.is_null() {
75            vortex_bail!("Cannot fill_null with a null value")
76        }
77
78        for kernel in kernels {
79            if let Some(output) = kernel.invoke(args)? {
80                return Ok(output);
81            }
82        }
83        if let Some(output) = array.invoke(&FILL_NULL_FN, args)? {
84            return Ok(output);
85        }
86
87        log::debug!("FillNullFn not implemented for {}", array.encoding_id());
88        if !array.is_canonical() {
89            let canonical_arr = array.to_canonical().into_array();
90            return Ok(fill_null(canonical_arr.as_ref(), fill_value)?.into());
91        }
92
93        vortex_bail!("fill null not implemented for DType {}", array.dtype())
94    }
95
96    fn return_dtype(&self, args: &InvocationArgs) -> VortexResult<DType> {
97        let FillNullArgs { array, fill_value } = FillNullArgs::try_from(args)?;
98        if !array.dtype().eq_ignore_nullability(fill_value.dtype()) {
99            vortex_bail!("FillNull value must match array type (ignoring nullability)");
100        }
101        Ok(fill_value.dtype().clone())
102    }
103
104    fn return_len(&self, args: &InvocationArgs) -> VortexResult<usize> {
105        let FillNullArgs { array, .. } = FillNullArgs::try_from(args)?;
106        Ok(array.len())
107    }
108
109    fn is_elementwise(&self) -> bool {
110        true
111    }
112}
113
114struct FillNullArgs<'a> {
115    array: &'a dyn Array,
116    fill_value: &'a Scalar,
117}
118
119impl<'a> TryFrom<&InvocationArgs<'a>> for FillNullArgs<'a> {
120    type Error = VortexError;
121
122    fn try_from(value: &InvocationArgs<'a>) -> Result<Self, Self::Error> {
123        if value.inputs.len() != 2 {
124            vortex_bail!("FillNull requires 2 arguments");
125        }
126
127        let array = value.inputs[0]
128            .array()
129            .ok_or_else(|| vortex_err!("FillNull requires an array"))?;
130        let fill_value = value.inputs[1]
131            .scalar()
132            .ok_or_else(|| vortex_err!("FillNull requires a scalar"))?;
133
134        Ok(FillNullArgs { array, fill_value })
135    }
136}
vortex_array/compute/fill_null.rs

vortex_array/compute/
fill_null.rs
