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129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
#include <DB/Functions/IFunction.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/IO/WriteBufferFromVector.h>
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#include <DB/IO/WriteBufferFromString.h>
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namespace DB
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{
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/** Функция для необычного преобразования в строку:
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*
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* bitmaskToList - принимает целое число - битовую маску, возвращает строку из степеней двойки через запятую.
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* например, bitmaskToList(50) = '2,16,32'
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*/
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class FunctionBitmaskToList : public IFunction
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{
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public:
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/// Получить основное имя функции.
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virtual String getName() const
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{
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return "bitmaskToList";
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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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virtual 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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+ toString(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 (!typeid_cast<const DataTypeUInt8 *>(type) &&
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!typeid_cast<const DataTypeUInt16 *>(type) &&
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!typeid_cast<const DataTypeUInt32 *>(type) &&
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!typeid_cast<const DataTypeUInt64 *>(type) &&
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!typeid_cast<const DataTypeInt8 *>(type) &&
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!typeid_cast<const DataTypeInt16 *>(type) &&
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!typeid_cast<const DataTypeInt32 *>(type) &&
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!typeid_cast<const DataTypeInt64 *>(type))
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throw Exception("Cannot format " + type->getName() + " as bitmask 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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inline static void writeBitmask(T x, WriteBuffer & out)
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{
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bool first = true;
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while (x)
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{
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T y = (x & (x - 1));
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T bit = x ^ y;
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x = y;
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if (!first)
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out.write(",", 1);
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first = false;
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writeIntText(bit, out);
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}
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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.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 * 2);
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offsets_to.resize(size);
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WriteBufferFromVector<ColumnString::Chars_t> buf_to(data_to);
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for (size_t i = 0; i < size; ++i)
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{
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writeBitmask<T>(vec_from[i], buf_to);
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writeChar(0, buf_to);
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offsets_to[i] = buf_to.count();
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}
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data_to.resize(buf_to.count());
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}
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else if (const ColumnConst<T> * col_from = typeid_cast<const ColumnConst<T> *>(&*block.getByPosition(arguments[0]).column))
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{
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std::string res;
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{
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WriteBufferFromString buf(res);
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writeBitmask<T>(col_from->getData(), buf);
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}
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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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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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private:
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};
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}
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