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