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
|
#include <Columns/ColumnString.h>
#include <Common/assert_cast.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/IFunction.h>
#include <base/range.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int BAD_ARGUMENTS;
}
namespace
{
class FunctionAppendTrailingCharIfAbsent : public IFunction
{
public:
static constexpr auto name = "appendTrailingCharIfAbsent";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionAppendTrailingCharIfAbsent>();
}
String getName() const override
{
return name;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
private:
size_t getNumberOfArguments() const override
{
return 2;
}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isString(arguments[0]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}", arguments[0]->getName(), getName());
if (!isString(arguments[1]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}", arguments[1]->getName(), getName());
return std::make_shared<DataTypeString>();
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const auto & column = arguments[0].column;
const auto & column_char = arguments[1].column;
if (!checkColumnConst<ColumnString>(column_char.get()))
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Second argument of function {} must be a constant string", getName());
String trailing_char_str = assert_cast<const ColumnConst &>(*column_char).getValue<String>();
if (trailing_char_str.size() != 1)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second argument of function {} must be a one-character string", getName());
if (const auto * col = checkAndGetColumn<ColumnString>(column.get()))
{
auto col_res = ColumnString::create();
const auto & src_data = col->getChars();
const auto & src_offsets = col->getOffsets();
auto & dst_data = col_res->getChars();
auto & dst_offsets = col_res->getOffsets();
const auto size = src_offsets.size();
dst_data.resize(src_data.size() + size);
dst_offsets.resize(size);
ColumnString::Offset src_offset{};
ColumnString::Offset dst_offset{};
for (const auto i : collections::range(0, size))
{
const auto src_length = src_offsets[i] - src_offset;
memcpySmallAllowReadWriteOverflow15(&dst_data[dst_offset], &src_data[src_offset], src_length);
src_offset = src_offsets[i];
dst_offset += src_length;
if (src_length > 1 && dst_data[dst_offset - 2] != static_cast<UInt8>(trailing_char_str.front()))
{
dst_data[dst_offset - 1] = trailing_char_str.front();
dst_data[dst_offset] = 0;
++dst_offset;
}
dst_offsets[i] = dst_offset;
}
dst_data.resize_assume_reserved(dst_offset);
return col_res;
}
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of argument of function {}",
arguments[0].column->getName(), getName());
}
};
}
REGISTER_FUNCTION(AppendTrailingCharIfAbsent)
{
factory.registerFunction<FunctionAppendTrailingCharIfAbsent>();
}
}
|
