1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
#[cfg(feature = "object")]
use arrow::array::Array;
use arrow::compute::filter::filter as filter_fn;
#[cfg(feature = "object")]
use crate::chunked_array::object::builder::ObjectChunkedBuilder;
use crate::prelude::*;
use crate::utils::align_chunks_binary;
macro_rules! check_filter_len {
($self:expr, $filter:expr) => {{
if $self.len() != $filter.len() {
return Err(PolarsError::ShapeMisMatch(
format!(
"Filter's length differs from that of the ChunkedArray/ Series. \
Length Self: {} Length mask: {}\
Self: {:?}; mask: {:?}",
$self.len(),
$filter.len(),
$self,
$filter
)
.into(),
));
}
}};
}
impl<T> ChunkFilter<T> for ChunkedArray<T>
where
T: PolarsNumericType,
{
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ChunkedArray<T>> {
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(ChunkedArray::from_slice(self.name(), &[])),
};
}
check_filter_len!(self, filter);
let (left, filter) = align_chunks_binary(self, filter);
let chunks = left
.downcast_iter()
.zip(filter.downcast_iter())
.map(|(left, mask)| filter_fn(left, mask).unwrap())
.collect::<Vec<_>>();
Ok(self.copy_with_chunks(chunks, true))
}
}
impl ChunkFilter<BooleanType> for BooleanChunked {
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ChunkedArray<BooleanType>> {
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(ChunkedArray::from_slice(self.name(), &[])),
};
}
check_filter_len!(self, filter);
let (left, filter) = align_chunks_binary(self, filter);
let chunks = left
.downcast_iter()
.zip(filter.downcast_iter())
.map(|(left, mask)| filter_fn(left, mask).unwrap())
.collect::<Vec<_>>();
Ok(self.copy_with_chunks(chunks, true))
}
}
impl ChunkFilter<Utf8Type> for Utf8Chunked {
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ChunkedArray<Utf8Type>> {
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(Utf8Chunked::full_null(self.name(), 0)),
};
}
check_filter_len!(self, filter);
let (left, filter) = align_chunks_binary(self, filter);
let chunks = left
.downcast_iter()
.zip(filter.downcast_iter())
.map(|(left, mask)| filter_fn(left, mask).unwrap())
.collect::<Vec<_>>();
Ok(self.copy_with_chunks(chunks, true))
}
}
#[cfg(feature = "dtype-binary")]
impl ChunkFilter<BinaryType> for BinaryChunked {
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ChunkedArray<BinaryType>> {
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(BinaryChunked::full_null(self.name(), 0)),
};
}
check_filter_len!(self, filter);
let (left, filter) = align_chunks_binary(self, filter);
let chunks = left
.downcast_iter()
.zip(filter.downcast_iter())
.map(|(left, mask)| filter_fn(left, mask).unwrap())
.collect::<Vec<_>>();
Ok(self.copy_with_chunks(chunks, true))
}
}
impl ChunkFilter<ListType> for ListChunked {
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ListChunked> {
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(ListChunked::from_chunks(
self.name(),
vec![new_empty_array(self.dtype().to_arrow())],
)),
};
}
let (left, filter) = align_chunks_binary(self, filter);
let chunks = left
.downcast_iter()
.zip(filter.downcast_iter())
.map(|(left, mask)| filter_fn(left, mask).unwrap())
.collect::<Vec<_>>();
let mut ca = self.clone();
ca.chunks = chunks;
ca.compute_len();
Ok(ca)
}
}
#[cfg(feature = "object")]
impl<T> ChunkFilter<ObjectType<T>> for ObjectChunked<T>
where
T: PolarsObject,
{
fn filter(&self, filter: &BooleanChunked) -> PolarsResult<ChunkedArray<ObjectType<T>>>
where
Self: Sized,
{
if filter.len() == 1 {
return match filter.get(0) {
Some(true) => Ok(self.clone()),
_ => Ok(ObjectChunked::from_chunks(self.name(), vec![])),
};
}
if self.is_empty() {
return Err(PolarsError::NoData(
"cannot filter empty object array".into(),
));
}
let chunks = self.downcast_iter().collect::<Vec<_>>();
let mut builder = ObjectChunkedBuilder::<T>::new(self.name(), self.len());
for (idx, mask) in filter.into_iter().enumerate() {
if mask.unwrap_or(false) {
let (chunk_idx, idx) = self.index_to_chunked_index(idx);
unsafe {
let arr = chunks.get_unchecked(chunk_idx);
match arr.is_null(idx) {
true => builder.append_null(),
false => {
let v = arr.value(idx);
builder.append_value(v.clone())
}
}
}
}
}
Ok(builder.finish())
}
}