mirror of
https://github.com/ClickHouse/ClickHouse.git
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237 lines
9.8 KiB
C++
237 lines
9.8 KiB
C++
#pragma once
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#include <DB/IO/WriteBufferFromVector.h>
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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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/// Получить имя функции.
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String getName() const
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{
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return Name::get();
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}
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/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
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DataTypePtr getReturnType(const DataTypes & arguments) const
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{
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if (arguments.size() != 1)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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const IDataType * type = &*arguments[0];
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if (!type->isNumeric() &&
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!dynamic_cast<const DataTypeDate *>(type) &&
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!dynamic_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 new 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 = dynamic_cast<const ColumnVector<T> *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnString * col_to = new ColumnString;
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block.getByPosition(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 = dynamic_cast<const ColumnConst<T> *>(&*block.getByPosition(arguments[0]).column))
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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.getByPosition(result).column = new 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 execute(Block & block, const ColumnNumbers & arguments, size_t result)
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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.getByPosition(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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typedef typename ToDataType::FieldType ToFieldType;
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/// Получить имя функции.
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String getName() const
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{
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return Name::get();
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}
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/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
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DataTypePtr getReturnType(const DataTypes & arguments) const
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{
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if (arguments.size() != 1)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ Poco::NumberFormatter::format(arguments.size()) + ", should be 1.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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const IDataType * type = &*arguments[0];
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if (!dynamic_cast<const DataTypeString *>(type) &&
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!dynamic_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 new ToDataType;
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}
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/// Выполнить функцию над блоком.
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void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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if (ColumnString * col_from = dynamic_cast<ColumnString *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnVector<ToFieldType> * col_res = new ColumnVector<ToFieldType>;
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block.getByPosition(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 = dynamic_cast<ColumnFixedString *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnVector<ToFieldType> * col_res = new ColumnVector<ToFieldType>;
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block.getByPosition(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 = dynamic_cast<ColumnConst<String> *>(&*block.getByPosition(arguments[0]).column))
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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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ColumnConst<ToFieldType> * col_res = new ColumnConst<ToFieldType>(col->size(), value);
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block.getByPosition(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.getByPosition(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 const char * get() { return "reinterpretAsUInt8"; } };
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struct NameReinterpretAsUInt16 { static const char * get() { return "reinterpretAsUInt16"; } };
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struct NameReinterpretAsUInt32 { static const char * get() { return "reinterpretAsUInt32"; } };
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struct NameReinterpretAsUInt64 { static const char * get() { return "reinterpretAsUInt64"; } };
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struct NameReinterpretAsInt8 { static const char * get() { return "reinterpretAsInt8"; } };
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struct NameReinterpretAsInt16 { static const char * get() { return "reinterpretAsInt16"; } };
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struct NameReinterpretAsInt32 { static const char * get() { return "reinterpretAsInt32"; } };
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struct NameReinterpretAsInt64 { static const char * get() { return "reinterpretAsInt64"; } };
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struct NameReinterpretAsFloat32 { static const char * get() { return "reinterpretAsFloat32"; } };
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struct NameReinterpretAsFloat64 { static const char * get() { return "reinterpretAsFloat64"; } };
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struct NameReinterpretAsDate { static const char * get() { return "reinterpretAsDate"; } };
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struct NameReinterpretAsDateTime { static const char * get() { return "reinterpretAsDateTime"; } };
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struct NameReinterpretAsString { static const char * get() { return "reinterpretAsString"; } };
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typedef FunctionReinterpretStringAs<DataTypeUInt8, NameReinterpretAsUInt8> FunctionReinterpretAsUInt8;
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typedef FunctionReinterpretStringAs<DataTypeUInt16, NameReinterpretAsUInt16> FunctionReinterpretAsUInt16;
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typedef FunctionReinterpretStringAs<DataTypeUInt32, NameReinterpretAsUInt32> FunctionReinterpretAsUInt32;
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typedef FunctionReinterpretStringAs<DataTypeUInt64, NameReinterpretAsUInt64> FunctionReinterpretAsUInt64;
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typedef FunctionReinterpretStringAs<DataTypeInt8, NameReinterpretAsInt8> FunctionReinterpretAsInt8;
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typedef FunctionReinterpretStringAs<DataTypeInt16, NameReinterpretAsInt16> FunctionReinterpretAsInt16;
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typedef FunctionReinterpretStringAs<DataTypeInt32, NameReinterpretAsInt32> FunctionReinterpretAsInt32;
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typedef FunctionReinterpretStringAs<DataTypeInt64, NameReinterpretAsInt64> FunctionReinterpretAsInt64;
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typedef FunctionReinterpretStringAs<DataTypeFloat32, NameReinterpretAsFloat32> FunctionReinterpretAsFloat32;
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typedef FunctionReinterpretStringAs<DataTypeFloat64, NameReinterpretAsFloat64> FunctionReinterpretAsFloat64;
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typedef FunctionReinterpretStringAs<DataTypeDate, NameReinterpretAsDate> FunctionReinterpretAsDate;
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typedef FunctionReinterpretStringAs<DataTypeDateTime, NameReinterpretAsDateTime> FunctionReinterpretAsDateTime;
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typedef FunctionReinterpretAsStringImpl<NameReinterpretAsString> FunctionReinterpretAsString;
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}
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