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https://github.com/ClickHouse/ClickHouse.git
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294 lines
14 KiB
C++
294 lines
14 KiB
C++
#pragma once
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#include <tr1/type_traits>
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#include <Poco/NumberFormatter.h>
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#include <Poco/UTF8Encoding.h>
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#include <Poco/Unicode.h>
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#include <DB/IO/WriteBufferFromVector.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataTypes/DataTypesNumberVariable.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 типов.
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*
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* Бывают двух видов:
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* - toType - преобразование "естественным образом";
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* - reinterpretAsType - преобразования чисел и дат в строки, содержащие тот же набор байт в машинном представлении, и наоборот.
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*/
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/** Преобразование чисел друг в друга, дат/дат-с-временем в числа и наоборот: делается обычным присваиванием.
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* (дата внутри хранится как количество дней с какого-то, дата-с-временем - как unix timestamp)
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*/
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template <typename FromDataType, typename ToDataType, typename Name>
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struct ConvertImpl
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{
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typedef typename FromDataType::FieldType FromFieldType;
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typedef typename ToDataType::FieldType ToFieldType;
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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if (const ColumnVector<FromFieldType> * col_from = dynamic_cast<const ColumnVector<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnVector<ToFieldType> * col_to = new ColumnVector<ToFieldType>;
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block.getByPosition(result).column = col_to;
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const typename ColumnVector<FromFieldType>::Container_t & vec_from = col_from->getData();
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typename ColumnVector<ToFieldType>::Container_t & vec_to = col_to->getData();
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size_t size = vec_from.size();
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vec_to.resize(size);
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for (size_t i = 0; i < size; ++i)
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vec_to[i] = vec_from[i];
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}
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else if (const ColumnConst<FromFieldType> * col_from = dynamic_cast<const ColumnConst<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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block.getByPosition(result).column = new ColumnConst<ToFieldType>(col_from->size(), col_from->getData());
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}
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else
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + Name::get(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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/** Преобразование даты в дату-с-временем: добавление нулевого времени.
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*/
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template <typename Name>
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struct ConvertImpl<DataTypeDate, DataTypeDateTime, Name>
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{
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typedef DataTypeDate::FieldType FromFieldType;
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typedef DataTypeDateTime::FieldType ToFieldType;
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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typedef DataTypeDate::FieldType FromFieldType;
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Yandex::DateLUTSingleton & date_lut = Yandex::DateLUTSingleton::instance();
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if (const ColumnVector<FromFieldType> * col_from = dynamic_cast<const ColumnVector<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnVector<ToFieldType> * col_to = new ColumnVector<ToFieldType>;
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block.getByPosition(result).column = col_to;
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const typename ColumnVector<FromFieldType>::Container_t & vec_from = col_from->getData();
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typename ColumnVector<ToFieldType>::Container_t & vec_to = col_to->getData();
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size_t size = vec_from.size();
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vec_to.resize(size);
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for (size_t i = 0; i < size; ++i)
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vec_to[i] = date_lut.fromDayNum(Yandex::DayNum_t(vec_from[i]));
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}
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else if (const ColumnConst<FromFieldType> * col_from = dynamic_cast<const ColumnConst<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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block.getByPosition(result).column = new ColumnConst<ToFieldType>(col_from->size(), date_lut.fromDayNum(Yandex::DayNum_t(col_from->getData())));
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}
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else
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + Name::get(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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/** Преобразование даты-с-временем в дату: отбрасывание времени.
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*/
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template <typename Name>
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struct ConvertImpl<DataTypeDateTime, DataTypeDate, Name>
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{
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typedef DataTypeDateTime::FieldType FromFieldType;
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typedef DataTypeDate::FieldType ToFieldType;
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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Yandex::DateLUTSingleton & date_lut = Yandex::DateLUTSingleton::instance();
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if (const ColumnVector<FromFieldType> * col_from = dynamic_cast<const ColumnVector<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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ColumnVector<ToFieldType> * col_to = new ColumnVector<ToFieldType>;
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block.getByPosition(result).column = col_to;
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const typename ColumnVector<FromFieldType>::Container_t & vec_from = col_from->getData();
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typename ColumnVector<ToFieldType>::Container_t & vec_to = col_to->getData();
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size_t size = vec_from.size();
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vec_to.resize(size);
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for (size_t i = 0; i < size; ++i)
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vec_to[i] = date_lut.toDayNum(vec_from[i]);
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}
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else if (const ColumnConst<FromFieldType> * col_from = dynamic_cast<const ColumnConst<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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block.getByPosition(result).column = new ColumnConst<ToFieldType>(col_from->size(), date_lut.toDayNum(col_from->getData()));
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}
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else
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + Name::get(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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/** Преобразование чисел в строки: через форматирование.
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*/
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template <typename FromDataType, typename Name>
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struct ConvertImpl<FromDataType, DataTypeString, Name>
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{
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typedef typename FromDataType::FieldType FromFieldType;
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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if (const ColumnVector<FromFieldType> * col_from = dynamic_cast<const ColumnVector<FromFieldType> *>(&*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<FromFieldType>::Container_t & vec_from = col_from->getData();
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ColumnUInt8::Container_t & data_to = dynamic_cast<ColumnUInt8 &>(col_to->getData()).getData();
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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 * 2);
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offsets_to.resize(size);
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WriteBufferFromVector<UInt8> write_buffer(data_to);
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for (size_t i = 0; i < size; ++i)
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{
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writeText<FromFieldType>(vec_from[i], write_buffer);
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writeChar(0, write_buffer);
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offsets_to[i] = write_buffer.count();
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}
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data_to.resize(write_buffer.count());
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}
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else if (const ColumnConst<FromFieldType> * col_from = dynamic_cast<const ColumnConst<FromFieldType> *>(&*block.getByPosition(arguments[0]).column))
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{
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std::vector<char> buf;
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WriteBufferFromVector<char> write_buffer(buf);
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writeText<FromFieldType>(col_from->getData(), write_buffer);
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block.getByPosition(result).column = new ColumnConstString(col_from->size(), std::string(&buf[0], write_buffer.count()));
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}
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else
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throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
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+ " of first argument of function " + Name::get(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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/** Преобразование строки в числа: через парсинг.
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*/
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template <typename ToDataType, typename Name>
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struct ConvertImpl<DataTypeString, ToDataType, Name>
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{
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typedef typename ToDataType::FieldType ToFieldType;
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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}
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};
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template <typename Name>
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struct ConvertImpl<DataTypeString, DataTypeString, Name>
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{
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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}
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};
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template <typename ToDataType, typename Name>
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class FunctionConvert : 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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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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IDataType * from_type = &*block.getByPosition(arguments[0]).type;
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if (dynamic_cast<const DataTypeUInt8 * >(from_type)) ConvertImpl<DataTypeUInt8, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeUInt16 * >(from_type)) ConvertImpl<DataTypeUInt16, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeUInt32 * >(from_type)) ConvertImpl<DataTypeUInt32, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeUInt64 * >(from_type)) ConvertImpl<DataTypeUInt64, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeInt8 * >(from_type)) ConvertImpl<DataTypeInt8, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeInt16 * >(from_type)) ConvertImpl<DataTypeInt16, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeInt32 * >(from_type)) ConvertImpl<DataTypeInt32, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeInt64 * >(from_type)) ConvertImpl<DataTypeInt64, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeFloat32 * >(from_type)) ConvertImpl<DataTypeFloat32, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeFloat64 * >(from_type)) ConvertImpl<DataTypeFloat64, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeVarUInt * >(from_type)) ConvertImpl<DataTypeVarUInt, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeVarInt * >(from_type)) ConvertImpl<DataTypeVarInt, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeDate * >(from_type)) ConvertImpl<DataTypeDate, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeDateTime * >(from_type)) ConvertImpl<DataTypeDateTime, ToDataType, Name>::execute(block, arguments, result);
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else if (dynamic_cast<const DataTypeString * >(from_type)) ConvertImpl<DataTypeString, ToDataType, Name>::execute(block, arguments, result);
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else
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throw Exception("Illegal type " + block.getByPosition(arguments[0]).type->getName() + " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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};
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struct NameToUInt8 { static const char * get() { return "toUInt8"; } };
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struct NameToUInt16 { static const char * get() { return "toUInt16"; } };
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struct NameToUInt32 { static const char * get() { return "toUInt32"; } };
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struct NameToUInt64 { static const char * get() { return "toUInt64"; } };
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struct NameToInt8 { static const char * get() { return "toInt8"; } };
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struct NameToInt16 { static const char * get() { return "toInt16"; } };
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struct NameToInt32 { static const char * get() { return "toInt32"; } };
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struct NameToInt64 { static const char * get() { return "toInt64"; } };
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struct NameToFloat32 { static const char * get() { return "toFloat32"; } };
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struct NameToFloat64 { static const char * get() { return "toFloat64"; } };
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struct NameToVarUInt { static const char * get() { return "toVarUInt"; } };
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struct NameToVatInt { static const char * get() { return "toVarInt"; } };
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struct NameToDate { static const char * get() { return "toDate"; } };
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struct NameToDateTime { static const char * get() { return "toDateTime"; } };
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struct NameToString { static const char * get() { return "toString"; } };
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typedef FunctionConvert<DataTypeUInt8, NameToUInt8> FunctionToUInt8;
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typedef FunctionConvert<DataTypeUInt16, NameToUInt16> FunctionToUInt16;
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typedef FunctionConvert<DataTypeUInt32, NameToUInt32> FunctionToUInt32;
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typedef FunctionConvert<DataTypeUInt64, NameToUInt64> FunctionToUInt64;
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typedef FunctionConvert<DataTypeInt8, NameToInt8> FunctionToInt8;
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typedef FunctionConvert<DataTypeInt16, NameToInt16> FunctionToInt16;
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typedef FunctionConvert<DataTypeInt32, NameToInt32> FunctionToInt32;
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typedef FunctionConvert<DataTypeInt64, NameToInt64> FunctionToInt64;
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typedef FunctionConvert<DataTypeFloat32, NameToFloat32> FunctionToFloat32;
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typedef FunctionConvert<DataTypeFloat64, NameToFloat64> FunctionToFloat64;
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typedef FunctionConvert<DataTypeVarUInt, NameToVarUInt> FunctionToVarUInt;
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typedef FunctionConvert<DataTypeVarInt, NameToVatInt> FunctionToVarInt;
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typedef FunctionConvert<DataTypeDate, NameToDate> FunctionToDate;
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typedef FunctionConvert<DataTypeDateTime, NameToDateTime> FunctionToDateTime;
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typedef FunctionConvert<DataTypeString, NameToString> FunctionToString;
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}
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