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
|
#include <base/demangle.h>
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <IO/WriteHelpers.h>
#include <Access/Common/AccessFlags.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
class FunctionDemangle : public IFunction
{
public:
static constexpr auto name = "demangle";
static FunctionPtr create(ContextPtr context)
{
context->checkAccess(AccessType::demangle);
return std::make_shared<FunctionDemangle>();
}
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override
{
return 1;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
{
return true;
}
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.size() != 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} needs exactly one argument; passed {}.",
getName(), arguments.size());
const auto & type = arguments[0].type;
if (!WhichDataType(type.get()).isString())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be String. "
"Found {} instead.", getName(), type->getName());
return std::make_shared<DataTypeString>();
}
bool useDefaultImplementationForConstants() const override
{
return true;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const ColumnPtr & column = arguments[0].column;
const ColumnString * column_concrete = checkAndGetColumn<ColumnString>(column.get());
if (!column_concrete)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of argument of function {}", column->getName(), getName());
auto result_column = ColumnString::create();
for (size_t i = 0; i < input_rows_count; ++i)
{
StringRef source = column_concrete->getDataAt(i);
auto demangled = tryDemangle(source.data);
if (demangled)
{
result_column->insertData(demangled.get(), strlen(demangled.get()));
}
else
{
result_column->insertData(source.data, source.size);
}
}
return result_column;
}
};
}
REGISTER_FUNCTION(Demangle)
{
factory.registerFunction<FunctionDemangle>();
}
}
|
