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
use multimap::MultiMap;
use pin_project::pin_project;
use serde_closure::FnMutNamed;
use std::{
hash::Hash, pin::Pin, task::{Context, Poll}, vec
};
use super::{FilterMapSync, MapSync, ParallelPipe, ParallelStream};
#[pin_project]
#[must_use]
pub struct LeftJoin<P, K, V1, V2> {
#[pin]
right: MapSync<P, LeftJoinClosure<K, V1, V2>>,
}
impl<P, K, V1, V2> LeftJoin<P, K, V1, V2> {
pub fn new(pipe: P, right: MultiMap<K, V2>) -> Self {
Self {
right: MapSync::new(pipe, LeftJoinClosure::new(right)),
}
}
}
impl_par_dist! {
impl<P, K, V1, V2> ParallelStream for LeftJoin<P, K, V1, V2>
where
P: ParallelStream<Item = (K, V1)>,
K: Eq + Hash + Clone + Send + 'static,
V1: 'static,
V2: Clone + Send + 'static,
{
type Item = (K, V1, ImplIter<V2>);
type Task = <MapSync<P, LeftJoinClosure<K, V1, V2>> as ParallelStream>::Task;
fn size_hint(&self) -> (usize, Option<usize>) {
self.right.size_hint()
}
fn next_task(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Task>> {
self.project().right.next_task(cx)
}
}
impl<P, K, V1, V2, Input> ParallelPipe<Input> for LeftJoin<P, K, V1, V2>
where
P: ParallelPipe<Input, Output = (K, V1)>,
K: Eq + Hash + Clone + Send + 'static,
V1: 'static,
V2: Clone + Send + 'static,
{
type Output = (K, V1, ImplIter<V2>);
type Task = <MapSync<P, LeftJoinClosure<K, V1, V2>> as ParallelPipe<Input>>::Task;
fn task(&self) -> Self::Task {
self.right.task()
}
}
}
FnMutNamed! {
pub type LeftJoinClosure<K, V1, V2> = |self, right: MultiMap<K, V2>|item=> (K, V1)| -> (K, V1, ImplIter<V2>) where ; where K: Eq, K: Hash, V2: Clone {
let v2 = self.right.get_vec(&item.0).map_or_else(Vec::new, Clone::clone).into_iter();
(item.0, item.1, ImplIter(v2))
}
}
#[pin_project]
#[must_use]
pub struct InnerJoin<P, K, V1, V2> {
#[pin]
right: FilterMapSync<P, InnerJoinClosure<K, V1, V2>>,
}
impl<P, K, V1, V2> InnerJoin<P, K, V1, V2> {
pub fn new(pipe: P, right: MultiMap<K, V2>) -> Self {
Self {
right: FilterMapSync::new(pipe, InnerJoinClosure::new(right)),
}
}
}
impl_par_dist! {
impl<P, K, V1, V2> ParallelStream for InnerJoin<P, K, V1, V2>
where
P: ParallelStream<Item = (K, V1)>,
K: Eq + Hash + Clone + Send + 'static,
V1: 'static,
V2: Clone + Send + 'static,
{
type Item = (K, ImplIter<V1>, ImplIter<V2>);
type Task = <FilterMapSync<P, InnerJoinClosure<K, V1, V2>> as ParallelStream>::Task;
fn size_hint(&self) -> (usize, Option<usize>) {
self.right.size_hint()
}
fn next_task(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Task>> {
self.project().right.next_task(cx)
}
}
impl<P, K, V1, V2, Input> ParallelPipe<Input> for InnerJoin<P, K, V1, V2>
where
P: ParallelPipe<Input, Output = (K, V1)>,
K: Eq + Hash + Clone + Send + 'static,
V1: 'static,
V2: Clone + Send + 'static,
{
type Output = (K, ImplIter<V1>, ImplIter<V2>);
type Task = <FilterMapSync<P, InnerJoinClosure<K, V1, V2>> as ParallelPipe<Input>>::Task;
fn task(&self) -> Self::Task {
self.right.task()
}
}
}
FnMutNamed! {
pub type InnerJoinClosure<K, V1, V2> = |self, right: MultiMap<K, V2>|item=> (K, V1)| -> Option<(K, ImplIter<V1>, ImplIter<V2>)> where ; where K: Eq, K: Hash, V2: Clone {
self.right.get_vec(&item.0).map(|v2| {
(item.0, ImplIter(vec![item.1].into_iter()), ImplIter(v2.clone().into_iter()))
})
}
}
pub struct ImplIter<T>(vec::IntoIter<T>);
impl<T> Iterator for ImplIter<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}