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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
use std::ffi::c_void;
use crate::common::{BorrowedValue, Ty};
use super::{IsColumnView, NullBits, NullsIter};
use bytes::Bytes;
type Item = u16;
type View = USmallIntView;
const ITEM_SIZE: usize = std::mem::size_of::<Item>();
#[derive(Debug, Clone)]
pub struct USmallIntView {
pub(crate) nulls: NullBits,
pub(crate) data: Bytes,
}
impl IsColumnView for View {
fn ty(&self) -> Ty {
Ty::USmallInt
}
fn from_borrowed_value_iter<'b>(iter: impl Iterator<Item = BorrowedValue<'b>>) -> Self {
Self::from_iter(iter.map(|v| v.to_u16()))
}
}
impl USmallIntView {
pub fn len(&self) -> usize {
self.data.len() / std::mem::size_of::<Item>()
}
pub fn as_raw_slice(&self) -> &[Item] {
unsafe { std::slice::from_raw_parts(self.data.as_ptr() as *const Item, self.len()) }
}
pub fn as_raw_ptr(&self) -> *const Item {
self.data.as_ptr() as *const Item
}
pub fn to_nulls_vec(&self) -> Vec<bool> {
self.is_null_iter().collect()
}
pub fn is_null_iter(&self) -> NullsIter {
NullsIter {
nulls: &self.nulls,
row: 0,
len: self.len(),
}
}
pub fn is_null(&self, row: usize) -> bool {
if row < self.len() {
unsafe { self.is_null_unchecked(row) }
} else {
false
}
}
pub unsafe fn is_null_unchecked(&self, row: usize) -> bool {
self.nulls.is_null_unchecked(row)
}
pub fn get(&self, row: usize) -> Option<Item> {
if row < self.len() {
unsafe { self.get_unchecked(row) }
} else {
None
}
}
#[inline(always)]
unsafe fn get_raw_at(&self, index: usize) -> *const Item {
self.data.as_ptr().offset((index * ITEM_SIZE) as isize) as _
}
pub unsafe fn get_unchecked(&self, row: usize) -> Option<Item> {
if self.nulls.is_null_unchecked(row) {
None
} else {
Some(*self.get_raw_at(row))
}
}
pub unsafe fn get_ref_unchecked(&self, row: usize) -> Option<*const Item> {
if self.nulls.is_null_unchecked(row) {
None
} else {
Some(self.get_raw_at(row))
}
}
pub unsafe fn get_value_unchecked(&self, row: usize) -> BorrowedValue {
self.get_unchecked(row)
.map(|v| BorrowedValue::USmallInt(v))
.unwrap_or(BorrowedValue::Null(Ty::USmallInt))
}
pub unsafe fn get_raw_value_unchecked(&self, row: usize) -> (Ty, u32, *const c_void) {
if self.nulls.is_null_unchecked(row) {
(
Ty::USmallInt,
std::mem::size_of::<Item>() as _,
std::ptr::null(),
)
} else {
(
Ty::USmallInt,
std::mem::size_of::<Item>() as _,
self.get_raw_at(row) as *const Item as _,
)
}
}
pub fn slice(&self, mut range: std::ops::Range<usize>) -> Option<Self> {
if range.start >= self.len() {
return None;
}
if range.end > self.len() {
range.end = self.len();
}
if range.len() == 0 {
return None;
}
let nulls = unsafe { self.nulls.slice(range.clone()) };
let data = self
.data
.slice(range.start * ITEM_SIZE..range.end * ITEM_SIZE);
Some(Self { nulls, data })
}
pub fn iter(&self) -> USmallIntViewIter {
USmallIntViewIter { view: self, row: 0 }
}
pub fn to_vec(&self) -> Vec<Option<Item>> {
self.iter().collect()
}
pub(crate) fn write_raw_into<W: std::io::Write>(&self, mut wtr: W) -> std::io::Result<usize> {
let nulls = self.nulls.0.as_ref();
wtr.write_all(nulls)?;
wtr.write_all(&self.data)?;
Ok(nulls.len() + self.data.len())
}
}
pub struct USmallIntViewIter<'a> {
view: &'a USmallIntView,
row: usize,
}
impl<'a> Iterator for USmallIntViewIter<'a> {
type Item = Option<Item>;
fn next(&mut self) -> Option<Self::Item> {
if self.row < self.view.len() {
let row = self.row;
self.row += 1;
Some(unsafe { self.view.get_unchecked(row) })
} else {
None
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
if self.row < self.view.len() {
let len = self.view.len() - self.row;
(len, Some(len))
} else {
(0, Some(0))
}
}
}
impl<'a> ExactSizeIterator for USmallIntViewIter<'a> {
fn len(&self) -> usize {
self.view.len() - self.row
}
}
impl<A: Into<Option<Item>>> FromIterator<A> for View {
fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self {
let (nulls, mut values): (Vec<bool>, Vec<_>) = iter
.into_iter()
.map(|v| match v.into() {
Some(v) => (false, v),
None => (true, Item::default()),
})
.unzip();
Self {
nulls: NullBits::from_iter(nulls),
data: Bytes::from({
let (ptr, len, cap) = (values.as_mut_ptr(), values.len(), values.capacity());
std::mem::forget(values);
unsafe { Vec::from_raw_parts(ptr as *mut u8, len * ITEM_SIZE, cap * ITEM_SIZE) }
}),
}
}
}
#[test]
fn test_slice() {
let data = [0, 1, Item::MIN, Item::MAX];
let view = View::from_iter(data);
dbg!(&view);
let slice = view.slice(1..3);
dbg!(&slice);
let data = [None, Some(Item::MIN), Some(Item::MAX), None];
let view = View::from_iter(data);
dbg!(&view);
let range = 1..4;
let slice = view.slice(range.clone()).unwrap();
for (v, i) in slice.iter().zip(range) {
assert_eq!(v, data[i]);
}
}