blob: b8e924a921fff134c1b6691dfd955f7598a35a6e (
plain) (
blame)
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
|
#pragma once
#include "clickhouse_config.h"
#if USE_DATASKETCHES
#include <boost/noncopyable.hpp>
#include <memory>
#include <base/StringRef.h>
#error #include <theta_sketch.hpp>
#error #include <theta_union.hpp>
#error #include <theta_intersection.hpp>
#error #include <theta_a_not_b.hpp>
namespace DB
{
template <typename Key>
class ThetaSketchData : private boost::noncopyable
{
private:
std::unique_ptr<datasketches::update_theta_sketch> sk_update;
std::unique_ptr<datasketches::theta_union> sk_union;
inline datasketches::update_theta_sketch * getSkUpdate()
{
if (!sk_update)
sk_update = std::make_unique<datasketches::update_theta_sketch>(datasketches::update_theta_sketch::builder().build());
return sk_update.get();
}
inline datasketches::theta_union * getSkUnion()
{
if (!sk_union)
sk_union = std::make_unique<datasketches::theta_union>(datasketches::theta_union::builder().build());
return sk_union.get();
}
public:
using value_type = Key;
ThetaSketchData() = default;
~ThetaSketchData() = default;
/// Insert original value without hash, as `datasketches::update_theta_sketch.update` will do the hash internal.
void insertOriginal(StringRef value)
{
getSkUpdate()->update(value.data, value.size);
}
/// Note that `datasketches::update_theta_sketch.update` will do the hash again.
void insert(Key value)
{
getSkUpdate()->update(value);
}
UInt64 size() const
{
if (sk_union)
return static_cast<UInt64>(sk_union->get_result().get_estimate());
else if (sk_update)
return static_cast<UInt64>(sk_update->get_estimate());
else
return 0;
}
void merge(const ThetaSketchData & rhs)
{
datasketches::theta_union * u = getSkUnion();
if (sk_update)
{
u->update(*sk_update);
sk_update.reset(nullptr);
}
if (rhs.sk_update)
u->update(*rhs.sk_update);
else if (rhs.sk_union)
u->update(rhs.sk_union->get_result());
}
void intersect(const ThetaSketchData & rhs)
{
datasketches::theta_union * u = getSkUnion();
if (sk_update)
{
u->update(*sk_update);
sk_update.reset(nullptr);
}
datasketches::theta_intersection theta_intersection;
theta_intersection.update(u->get_result());
if (rhs.sk_update)
theta_intersection.update(*rhs.sk_update);
else if (rhs.sk_union)
theta_intersection.update(rhs.sk_union->get_result());
sk_union.reset(nullptr);
u = getSkUnion();
u->update(theta_intersection.get_result());
}
void aNotB(const ThetaSketchData & rhs)
{
datasketches::theta_union * u = getSkUnion();
if (sk_update)
{
u->update(*sk_update);
sk_update.reset(nullptr);
}
datasketches::theta_a_not_b a_not_b;
if (rhs.sk_update)
{
datasketches::compact_theta_sketch result = a_not_b.compute(u->get_result(), *rhs.sk_update);
sk_union.reset(nullptr);
u = getSkUnion();
u->update(result);
}
else if (rhs.sk_union)
{
datasketches::compact_theta_sketch result = a_not_b.compute(u->get_result(), rhs.sk_union->get_result());
sk_union.reset(nullptr);
u = getSkUnion();
u->update(result);
}
}
/// You can only call for an empty object.
void read(DB::ReadBuffer & in)
{
datasketches::compact_theta_sketch::vector_bytes bytes;
readVectorBinary(bytes, in);
if (!bytes.empty())
{
auto sk = datasketches::compact_theta_sketch::deserialize(bytes.data(), bytes.size());
getSkUnion()->update(sk);
}
}
void write(DB::WriteBuffer & out) const
{
if (sk_update)
{
auto bytes = sk_update->compact().serialize();
writeVectorBinary(bytes, out);
}
else if (sk_union)
{
auto bytes = sk_union->get_result().serialize();
writeVectorBinary(bytes, out);
}
else
{
datasketches::compact_theta_sketch::vector_bytes bytes;
writeVectorBinary(bytes, out);
}
}
};
}
#endif
|
