mirror of
https://github.com/ClickHouse/ClickHouse.git
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236 lines
9.6 KiB
C++
236 lines
9.6 KiB
C++
#pragma once
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#include <DB/IO/ReadBufferFromString.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypeFixedString.h>
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#include <DB/DataTypes/DataTypeDate.h>
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#include <DB/DataTypes/DataTypeDateTime.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/Columns/ColumnFixedString.h>
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#include <DB/Columns/ColumnConst.h>
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#include <DB/Functions/IFunction.h>
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namespace DB
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{
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/** Функции преобразования чисел и дат в строки, содержащие тот же набор байт в машинном представлении, и обратно.
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*/
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template<typename Name>
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class FunctionReinterpretAsStringImpl : public IFunction
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{
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public:
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static constexpr auto name = Name::name;
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionReinterpretAsStringImpl>(); };
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/// Получить имя функции.
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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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size_t getNumberOfArguments() const override { return 1; }
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/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const IDataType * type = &*arguments[0];
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if (!type->isNumeric() &&
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!typeid_cast<const DataTypeDate *>(type) &&
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!typeid_cast<const DataTypeDateTime *>(type))
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throw Exception("Cannot reinterpret " + type->getName() + " as String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeString>();
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}
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template<typename T>
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bool executeType(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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if (const ColumnVector<T> * col_from = typeid_cast<const ColumnVector<T> *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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auto col_to = std::make_shared<ColumnString>();
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block.safeGetByPosition(result).column = col_to;
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const typename ColumnVector<T>::Container_t & vec_from = col_from->getData();
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ColumnString::Chars_t & data_to = col_to->getChars();
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ColumnString::Offsets_t & offsets_to = col_to->getOffsets();
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size_t size = vec_from.size();
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data_to.resize(size * (sizeof(T) + 1));
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offsets_to.resize(size);
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int pos = 0;
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for (size_t i = 0; i < size; ++i)
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{
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memcpy(&data_to[pos], &vec_from[i], sizeof(T));
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int len = sizeof(T);
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while (len > 0 && data_to[pos + len - 1] == '\0')
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--len;
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pos += len;
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data_to[pos++] = '\0';
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offsets_to[i] = pos;
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}
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data_to.resize(pos);
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}
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else if (const ColumnConst<T> * col_from = typeid_cast<const ColumnConst<T> *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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std::string res(reinterpret_cast<const char *>(&col_from->getData()), sizeof(T));
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while (!res.empty() && res[res.length() - 1] == '\0')
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res.erase(res.end() - 1);
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block.safeGetByPosition(result).column = std::make_shared<ColumnConstString>(col_from->size(), res);
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}
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else
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{
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return false;
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}
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return true;
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}
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/// Выполнить функцию над блоком.
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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if (!( executeType<UInt8>(block, arguments, result)
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|| executeType<UInt16>(block, arguments, result)
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|| executeType<UInt32>(block, arguments, result)
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|| executeType<UInt64>(block, arguments, result)
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|| executeType<Int8>(block, arguments, result)
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|| executeType<Int16>(block, arguments, result)
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|| executeType<Int32>(block, arguments, result)
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|| executeType<Int64>(block, arguments, result)
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|| executeType<Float32>(block, arguments, result)
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|| executeType<Float64>(block, arguments, result)))
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throw Exception("Illegal column " + block.safeGetByPosition(arguments[0]).column->getName()
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+ " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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template<typename ToDataType, typename Name>
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class FunctionReinterpretStringAs : public IFunction
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{
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public:
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static constexpr auto name = Name::name;
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionReinterpretStringAs>(); };
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using ToFieldType = typename ToDataType::FieldType;
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/// Получить имя функции.
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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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size_t getNumberOfArguments() const override { return 1; }
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/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const IDataType * type = &*arguments[0];
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if (!typeid_cast<const DataTypeString *>(type) &&
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!typeid_cast<const DataTypeFixedString *>(type))
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throw Exception("Cannot reinterpret " + type->getName() + " as " + ToDataType().getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<ToDataType>();
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}
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/// Выполнить функцию над блоком.
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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if (ColumnString * col_from = typeid_cast<ColumnString *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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auto col_res = std::make_shared<ColumnVector<ToFieldType>>();
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block.safeGetByPosition(result).column = col_res;
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ColumnString::Chars_t & data_from = col_from->getChars();
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ColumnString::Offsets_t & offsets_from = col_from->getOffsets();
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size_t size = offsets_from.size();
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typename ColumnVector<ToFieldType>::Container_t & vec_res = col_res->getData();
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vec_res.resize(size);
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size_t offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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ToFieldType value = 0;
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memcpy(&value, &data_from[offset], std::min(sizeof(ToFieldType), offsets_from[i] - offset - 1));
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vec_res[i] = value;
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offset = offsets_from[i];
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}
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}
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else if (ColumnFixedString * col_from = typeid_cast<ColumnFixedString *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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auto col_res = std::make_shared<ColumnVector<ToFieldType>>();
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block.safeGetByPosition(result).column = col_res;
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ColumnString::Chars_t & data_from = col_from->getChars();
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size_t step = col_from->getN();
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size_t size = data_from.size() / step;
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typename ColumnVector<ToFieldType>::Container_t & vec_res = col_res->getData();
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vec_res.resize(size);
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size_t offset = 0;
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size_t copy_size = std::min(step, sizeof(ToFieldType));
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for (size_t i = 0; i < size; ++i)
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{
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ToFieldType value = 0;
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memcpy(&value, &data_from[offset], copy_size);
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vec_res[i] = value;
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offset += step;
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}
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}
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else if (ColumnConst<String> * col = typeid_cast<ColumnConst<String> *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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ToFieldType value = 0;
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const String & str = col->getData();
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memcpy(&value, str.data(), std::min(sizeof(ToFieldType), str.length()));
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auto col_res = std::make_shared<ColumnConst<ToFieldType>>(col->size(), value);
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block.safeGetByPosition(result).column = col_res;
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}
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else
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{
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throw Exception("Illegal column " + block.safeGetByPosition(arguments[0]).column->getName()
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+ " 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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struct NameReinterpretAsUInt8 { static constexpr auto name = "reinterpretAsUInt8"; };
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struct NameReinterpretAsUInt16 { static constexpr auto name = "reinterpretAsUInt16"; };
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struct NameReinterpretAsUInt32 { static constexpr auto name = "reinterpretAsUInt32"; };
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struct NameReinterpretAsUInt64 { static constexpr auto name = "reinterpretAsUInt64"; };
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struct NameReinterpretAsInt8 { static constexpr auto name = "reinterpretAsInt8"; };
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struct NameReinterpretAsInt16 { static constexpr auto name = "reinterpretAsInt16"; };
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struct NameReinterpretAsInt32 { static constexpr auto name = "reinterpretAsInt32"; };
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struct NameReinterpretAsInt64 { static constexpr auto name = "reinterpretAsInt64"; };
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struct NameReinterpretAsFloat32 { static constexpr auto name = "reinterpretAsFloat32"; };
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struct NameReinterpretAsFloat64 { static constexpr auto name = "reinterpretAsFloat64"; };
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struct NameReinterpretAsDate { static constexpr auto name = "reinterpretAsDate"; };
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struct NameReinterpretAsDateTime { static constexpr auto name = "reinterpretAsDateTime"; };
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struct NameReinterpretAsString { static constexpr auto name = "reinterpretAsString"; };
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using FunctionReinterpretAsUInt8 = FunctionReinterpretStringAs<DataTypeUInt8, NameReinterpretAsUInt8> ;
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using FunctionReinterpretAsUInt16 = FunctionReinterpretStringAs<DataTypeUInt16, NameReinterpretAsUInt16>;
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using FunctionReinterpretAsUInt32 = FunctionReinterpretStringAs<DataTypeUInt32, NameReinterpretAsUInt32>;
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using FunctionReinterpretAsUInt64 = FunctionReinterpretStringAs<DataTypeUInt64, NameReinterpretAsUInt64>;
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using FunctionReinterpretAsInt8 = FunctionReinterpretStringAs<DataTypeInt8, NameReinterpretAsInt8> ;
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using FunctionReinterpretAsInt16 = FunctionReinterpretStringAs<DataTypeInt16, NameReinterpretAsInt16> ;
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using FunctionReinterpretAsInt32 = FunctionReinterpretStringAs<DataTypeInt32, NameReinterpretAsInt32> ;
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using FunctionReinterpretAsInt64 = FunctionReinterpretStringAs<DataTypeInt64, NameReinterpretAsInt64> ;
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using FunctionReinterpretAsFloat32 = FunctionReinterpretStringAs<DataTypeFloat32, NameReinterpretAsFloat32>;
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using FunctionReinterpretAsFloat64 = FunctionReinterpretStringAs<DataTypeFloat64, NameReinterpretAsFloat64>;
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using FunctionReinterpretAsDate = FunctionReinterpretStringAs<DataTypeDate, NameReinterpretAsDate> ;
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using FunctionReinterpretAsDateTime = FunctionReinterpretStringAs<DataTypeDateTime, NameReinterpretAsDateTime>;
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using FunctionReinterpretAsString = FunctionReinterpretAsStringImpl<NameReinterpretAsString>;
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}
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