forked from ClickHouse/ClickHouse
-
Notifications
You must be signed in to change notification settings - Fork 1
/
concat.cpp
249 lines (207 loc) · 9.8 KB
/
concat.cpp
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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionsConversion.h>
#include <Functions/GatherUtils/Algorithms.h>
#include <Functions/GatherUtils/Sinks.h>
#include <Functions/GatherUtils/Sources.h>
#include <Functions/IFunction.h>
#include <Functions/formatString.h>
#include <IO/WriteHelpers.h>
#include <base/map.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
using namespace GatherUtils;
namespace
{
template <typename Name, bool is_injective>
class ConcatImpl : public IFunction
{
public:
static constexpr auto name = Name::name;
explicit ConcatImpl(ContextPtr context_) : context(context_) { }
static FunctionPtr create(ContextPtr context) { return std::make_shared<ConcatImpl>(context); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isInjective(const ColumnsWithTypeAndName &) const override { return is_injective; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments.size() < 2)
throw Exception(
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Number of arguments for function {} doesn't match: passed {}, should be at least 2",
getName(),
arguments.size());
return std::make_shared<DataTypeString>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
/// Format function is not proven to be faster for two arguments.
/// Actually there is overhead of 2 to 5 extra instructions for each string for checking empty strings in FormatImpl.
/// Though, benchmarks are really close, for most examples we saw executeBinary is slightly faster (0-3%).
/// For 3 and more arguments FormatStringImpl is much faster (up to 50-60%).
if (arguments.size() == 2)
return executeBinary(arguments, input_rows_count);
return executeFormatImpl(arguments, input_rows_count);
}
private:
ContextWeakPtr context;
ColumnPtr executeBinary(const ColumnsWithTypeAndName & arguments, size_t input_rows_count) const
{
const IColumn * c0 = arguments[0].column.get();
const IColumn * c1 = arguments[1].column.get();
const ColumnString * c0_string = checkAndGetColumn<ColumnString>(c0);
const ColumnString * c1_string = checkAndGetColumn<ColumnString>(c1);
const ColumnConst * c0_const_string = checkAndGetColumnConst<ColumnString>(c0);
const ColumnConst * c1_const_string = checkAndGetColumnConst<ColumnString>(c1);
auto col_res = ColumnString::create();
if (c0_string && c1_string)
concat(StringSource(*c0_string), StringSource(*c1_string), StringSink(*col_res, c0->size()));
else if (c0_string && c1_const_string)
concat(StringSource(*c0_string), ConstSource<StringSource>(*c1_const_string), StringSink(*col_res, c0->size()));
else if (c0_const_string && c1_string)
concat(ConstSource<StringSource>(*c0_const_string), StringSource(*c1_string), StringSink(*col_res, c0->size()));
else
{
/// Fallback: use generic implementation for not very important cases.
return executeFormatImpl(arguments, input_rows_count);
}
return col_res;
}
ColumnPtr executeFormatImpl(const ColumnsWithTypeAndName & arguments, size_t input_rows_count) const
{
const size_t num_arguments = arguments.size();
assert(num_arguments >= 2);
auto col_res = ColumnString::create();
std::vector<const ColumnString::Chars *> data(num_arguments);
std::vector<const ColumnString::Offsets *> offsets(num_arguments);
std::vector<size_t> fixed_string_sizes(num_arguments);
std::vector<std::optional<String>> constant_strings(num_arguments);
std::vector<ColumnString::MutablePtr> converted_col_ptrs(num_arguments);
bool has_column_string = false;
bool has_column_fixed_string = false;
for (size_t i = 0; i < num_arguments; ++i)
{
const ColumnPtr & column = arguments[i].column;
if (const ColumnString * col = checkAndGetColumn<ColumnString>(column.get()))
{
has_column_string = true;
data[i] = &col->getChars();
offsets[i] = &col->getOffsets();
}
else if (const ColumnFixedString * fixed_col = checkAndGetColumn<ColumnFixedString>(column.get()))
{
has_column_fixed_string = true;
data[i] = &fixed_col->getChars();
fixed_string_sizes[i] = fixed_col->getN();
}
else if (const ColumnConst * const_col = checkAndGetColumnConstStringOrFixedString(column.get()))
{
constant_strings[i] = const_col->getValue<String>();
}
else
{
/// A non-String/non-FixedString-type argument: use the default serialization to convert it to String
auto full_column = column->convertToFullIfNeeded();
auto serialization = arguments[i].type->getDefaultSerialization();
auto converted_col_str = ColumnString::create();
ColumnStringHelpers::WriteHelper write_helper(*converted_col_str, column->size());
auto & write_buffer = write_helper.getWriteBuffer();
FormatSettings format_settings;
for (size_t row = 0; row < column->size(); ++row)
{
serialization->serializeText(*full_column, row, write_buffer, format_settings);
write_helper.rowWritten();
}
write_helper.finalize();
/// Keep the pointer alive
converted_col_ptrs[i] = std::move(converted_col_str);
/// Same as the normal `ColumnString` branch
has_column_string = true;
data[i] = &converted_col_ptrs[i]->getChars();
offsets[i] = &converted_col_ptrs[i]->getOffsets();
}
}
String pattern;
pattern.reserve(2 * num_arguments);
for (size_t i = 0; i < num_arguments; ++i)
pattern += "{}";
FormatStringImpl::formatExecute(
has_column_string,
has_column_fixed_string,
std::move(pattern),
data,
offsets,
fixed_string_sizes,
constant_strings,
col_res->getChars(),
col_res->getOffsets(),
input_rows_count);
return col_res;
}
};
struct NameConcat
{
static constexpr auto name = "concat";
};
struct NameConcatAssumeInjective
{
static constexpr auto name = "concatAssumeInjective";
};
using FunctionConcat = ConcatImpl<NameConcat, false>;
using FunctionConcatAssumeInjective = ConcatImpl<NameConcatAssumeInjective, true>;
/// Works with arrays via `arrayConcat`, maps via `mapConcat`, and tuples via `tupleConcat`.
/// Additionally, allows concatenation of arbitrary types that can be cast to string using the corresponding default serialization.
class ConcatOverloadResolver : public IFunctionOverloadResolver
{
public:
static constexpr auto name = "concat";
static FunctionOverloadResolverPtr create(ContextPtr context) { return std::make_unique<ConcatOverloadResolver>(context); }
explicit ConcatOverloadResolver(ContextPtr context_) : context(context_) { }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 0; }
bool isVariadic() const override { return true; }
FunctionBasePtr buildImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & return_type) const override
{
if (arguments.size() == 1)
return FunctionFactory::instance().getImpl("toString", context)->build(arguments);
if (std::ranges::all_of(arguments, [](const auto & elem) { return isArray(elem.type); }))
return FunctionFactory::instance().getImpl("arrayConcat", context)->build(arguments);
if (std::ranges::all_of(arguments, [](const auto & elem) { return isMap(elem.type); }))
return FunctionFactory::instance().getImpl("mapConcat", context)->build(arguments);
if (std::ranges::all_of(arguments, [](const auto & elem) { return isTuple(elem.type); }))
return FunctionFactory::instance().getImpl("tupleConcat", context)->build(arguments);
return std::make_unique<FunctionToFunctionBaseAdaptor>(
FunctionConcat::create(context),
collections::map<DataTypes>(arguments, [](const auto & elem) { return elem.type; }),
return_type);
}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Number of arguments for function {} doesn't match: passed {}, should be at least 1.",
getName(),
arguments.size());
/// We always return Strings from concat, even if arguments were fixed strings.
return std::make_shared<DataTypeString>();
}
private:
ContextPtr context;
};
}
REGISTER_FUNCTION(Concat)
{
factory.registerFunction<ConcatOverloadResolver>({}, FunctionFactory::CaseInsensitive);
factory.registerFunction<FunctionConcatAssumeInjective>();
}
}