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
|
#pragma once
#include <Functions/extractTimeZoneFromFunctionArguments.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeDateTime64.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnsDateTime.h>
#include <Columns/ColumnsNumber.h>
#include <Interpreters/Context.h>
#include <base/arithmeticOverflow.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
/** According to Twitter's post on Snowflake, we can extract the timestamp for a snowflake ID by right shifting
* the snowflake ID by 22 bits(10 bits machine ID and 12 bits sequence ID) and adding the Twitter epoch time of 1288834974657.
* https://en.wikipedia.org/wiki/Snowflake_ID
* https://blog.twitter.com/engineering/en_us/a/2010/announcing-snowflake
* https://ws-dl.blogspot.com/2019/08/2019-08-03-tweetedat-finding-tweet.html
*/
static constexpr size_t snowflake_epoch = 1288834974657L;
static constexpr int time_shift = 22;
class FunctionDateTimeToSnowflake : public IFunction
{
private:
const char * name;
public:
explicit FunctionDateTimeToSnowflake(const char * name_) : name(name_) { }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool isVariadic() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (!isDateTime(arguments[0].type))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be DateTime", name);
return std::make_shared<DataTypeInt64>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto & src = arguments[0];
const auto & src_column = *src.column;
auto res_column = ColumnInt64::create(input_rows_count);
auto & res_data = res_column->getData();
const auto & src_data = typeid_cast<const ColumnUInt32 &>(src_column).getData();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = (Int64(src_data[i]) * 1000 - snowflake_epoch) << time_shift;
return res_column;
}
};
class FunctionSnowflakeToDateTime : public IFunction
{
private:
const char * name;
const bool allow_nonconst_timezone_arguments;
public:
explicit FunctionSnowflakeToDateTime(const char * name_, ContextPtr context)
: name(name_)
, allow_nonconst_timezone_arguments(context->getSettings().allow_nonconst_timezone_arguments)
{}
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 0; }
bool isVariadic() const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.empty() || arguments.size() > 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} takes one or two arguments", name);
if (!typeid_cast<const DataTypeInt64 *>(arguments[0].type.get()))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The first argument for function {} must be Int64", name);
std::string timezone;
if (arguments.size() == 2)
timezone = extractTimeZoneNameFromFunctionArguments(arguments, 1, 0, allow_nonconst_timezone_arguments);
return std::make_shared<DataTypeDateTime>(timezone);
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto & src = arguments[0];
const auto & src_column = *src.column;
auto res_column = ColumnUInt32::create(input_rows_count);
auto & res_data = res_column->getData();
if (const auto * src_column_non_const = typeid_cast<const ColumnInt64 *>(&src_column))
{
const auto & src_data = src_column_non_const->getData();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = static_cast<UInt32>(
((src_data[i] >> time_shift) + snowflake_epoch) / 1000);
}
else if (const auto * src_column_const = typeid_cast<const ColumnConst *>(&src_column))
{
Int64 src_val = src_column_const->getValue<Int64>();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = static_cast<UInt32>(
((src_val >> time_shift) + snowflake_epoch) / 1000);
}
else
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal argument for function {}", name);
return res_column;
}
};
class FunctionDateTime64ToSnowflake : public IFunction
{
private:
const char * name;
public:
explicit FunctionDateTime64ToSnowflake(const char * name_) : name(name_) { }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool isVariadic() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (!isDateTime64(arguments[0].type))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be DateTime64", name);
return std::make_shared<DataTypeInt64>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto & src = arguments[0];
const auto & src_column = *src.column;
auto res_column = ColumnInt64::create(input_rows_count);
auto & res_data = res_column->getData();
const auto & src_data = typeid_cast<const ColumnDecimal<DateTime64> &>(src_column).getData();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = (src_data[i] - snowflake_epoch) << time_shift;
return res_column;
}
};
class FunctionSnowflakeToDateTime64 : public IFunction
{
private:
const char * name;
const bool allow_nonconst_timezone_arguments;
public:
explicit FunctionSnowflakeToDateTime64(const char * name_, ContextPtr context)
: name(name_)
, allow_nonconst_timezone_arguments(context->getSettings().allow_nonconst_timezone_arguments)
{}
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 0; }
bool isVariadic() const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.empty() || arguments.size() > 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} takes one or two arguments", name);
if (!typeid_cast<const DataTypeInt64 *>(arguments[0].type.get()))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The first argument for function {} must be Int64", name);
std::string timezone;
if (arguments.size() == 2)
timezone = extractTimeZoneNameFromFunctionArguments(arguments, 1, 0, allow_nonconst_timezone_arguments);
return std::make_shared<DataTypeDateTime64>(3, timezone);
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const auto & src = arguments[0];
const auto & src_column = *src.column;
auto res_column = ColumnDecimal<DateTime64>::create(input_rows_count, 3);
auto & res_data = res_column->getData();
if (const auto * src_column_non_const = typeid_cast<const ColumnInt64 *>(&src_column))
{
const auto & src_data = src_column_non_const->getData();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = (src_data[i] >> time_shift) + snowflake_epoch;
}
else if (const auto * src_column_const = typeid_cast<const ColumnConst *>(&src_column))
{
Int64 src_val = src_column_const->getValue<Int64>();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = (src_val >> time_shift) + snowflake_epoch;
}
else
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal argument for function {}", name);
return res_column;
}
};
}
|
