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229 lines
7.6 KiB
C++
229 lines
7.6 KiB
C++
#pragma once
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#include <math.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/Columns/ColumnVector.h>
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#include <DB/Functions/IFunction.h>
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namespace DB
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{
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/** Вспомогательные функции:
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*
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* visibleWidth(x) - вычисляет приблизительную ширину при выводе значения в текстовом (tab-separated) виде на консоль.
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*/
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template <typename T>
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static void numWidthVector(const std::vector<T> & a, std::vector<UInt64> & c)
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{
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size_t size = a.size();
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for (size_t i = 0; i < size; ++i)
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if (a[i] >= 0)
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c[i] = a[i] ? 1 + log10(a[i]) : 1;
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else
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c[i] = 2 + log10(-a[i]);
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}
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template <typename T>
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static void numWidthConstant(T a, UInt64 & c)
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{
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if (a >= 0)
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c = a ? 1 + log10(a) : 1;
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else
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c = 2 + log10(-a);
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}
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inline UInt64 floatWidth(double x)
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{
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/// Не быстро.
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unsigned size = WRITE_HELPERS_DEFAULT_FLOAT_PRECISION + 10;
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char tmp[size]; /// знаки, +0.0e+123\0
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int res = std::snprintf(tmp, size, "%.*g", WRITE_HELPERS_DEFAULT_FLOAT_PRECISION, x);
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if (res >= static_cast<int>(size) || res <= 0)
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throw Exception("Cannot print float or double number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
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return res;
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}
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template <typename T>
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static void floatWidthVector(const std::vector<T> & a, std::vector<UInt64> & c)
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{
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size_t size = a.size();
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for (size_t i = 0; i < size; ++i)
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c[i] = floatWidth(a[i]);
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}
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template <typename T>
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static void floatWidthConstant(T a, UInt64 & c)
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{
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c = floatWidth(a);
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}
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template <> inline void numWidthVector<Float64>(const std::vector<Float64> & a, std::vector<UInt64> & c) { floatWidthVector(a, c); }
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template <> inline void numWidthVector<Float32>(const std::vector<Float32> & a, std::vector<UInt64> & c) { floatWidthVector(a, c); }
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template <> inline void numWidthConstant<Float64>(Float64 a, UInt64 & c) { floatWidthConstant(a, c); }
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template <> inline void numWidthConstant<Float32>(Float32 a, UInt64 & c) { floatWidthConstant(a, c); }
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static inline UInt64 stringWidth(const UInt8 * pos, const UInt8 * end)
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{
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UInt64 res = 0;
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for (; pos < end; ++pos)
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{
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if (*pos == '\b' || *pos == '\f' || *pos == '\n' || *pos == '\r' || *pos == '\t' || *pos == '\0' || *pos == '\'' || *pos == '\\')
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++res;
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if (*pos <= 0x7F || *pos >= 0xC0)
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++res;
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}
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return res;
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}
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static inline void stringWidthVector(const std::vector<UInt8> & data, const std::vector<UInt64> & offsets, std::vector<UInt64> & res)
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{
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size_t size = offsets.size();
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size_t prev_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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res[i] = stringWidth(&data[prev_offset], &data[offsets[i] - 1]);
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prev_offset = offsets[i];
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}
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}
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static inline void stringWidthFixedVector(const std::vector<UInt8> & data, size_t n, std::vector<UInt64> & res)
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{
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size_t size = data.size() / n;
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for (size_t i = 0; i < size; ++i)
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res[i] = stringWidth(&data[i * n], &data[(i + 1) * n]);
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}
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inline void stringWidthConstant(const String & data, UInt64 & res)
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{
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res = stringWidth(reinterpret_cast<const UInt8 *>(data.data()), reinterpret_cast<const UInt8 *>(data.data()) + data.size());
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}
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class FunctionVisibleWidth : public IFunction
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{
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private:
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template <typename T>
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bool executeConstNumber(Block & block, const ColumnPtr & column, size_t result)
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{
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if (const ColumnConst<T> * col = dynamic_cast<const ColumnConst<T> *>(&*column))
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{
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UInt64 res = 0;
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numWidthConstant(col->getData(), res);
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block.getByPosition(result).column = new ColumnConstUInt64(column->size(), res);
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return true;
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}
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else
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return false;
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}
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template <typename T>
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bool executeNumber(Block & block, const ColumnPtr & column, size_t result)
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{
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if (const ColumnVector<T> * col = dynamic_cast<const ColumnVector<T> *>(&*column))
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{
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ColumnUInt64 * res = new ColumnUInt64(column->size());
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numWidthVector(col->getData(), res->getData());
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block.getByPosition(result).column = res;
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return true;
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}
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else
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return false;
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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 "visibleWidth";
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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 DataTypeUInt64;
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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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const ColumnPtr column = block.getByPosition(arguments[0]).column;
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const DataTypePtr type = block.getByPosition(arguments[0]).type;
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size_t rows = column->size();
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if (dynamic_cast<const DataTypeDate *>(&*type))
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{
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block.getByPosition(result).column = new ColumnConstUInt64(rows, strlen("0000-00-00"));
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}
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else if (dynamic_cast<const DataTypeDateTime *>(&*type))
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{
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block.getByPosition(result).column = new ColumnConstUInt64(rows, strlen("0000-00-00 00:00:00"));
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}
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else if (executeConstNumber<UInt8>(block, column, result)
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|| executeConstNumber<UInt16>(block, column, result)
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|| executeConstNumber<UInt32>(block, column, result)
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|| executeConstNumber<UInt64>(block, column, result)
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|| executeConstNumber<Int8>(block, column, result)
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|| executeConstNumber<Int16>(block, column, result)
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|| executeConstNumber<Int32>(block, column, result)
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|| executeConstNumber<Int64>(block, column, result)
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|| executeConstNumber<Float32>(block, column, result) /// TODO: правильная работа с float
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|| executeConstNumber<Float64>(block, column, result)
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|| executeNumber<UInt8>(block, column, result)
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|| executeNumber<UInt16>(block, column, result)
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|| executeNumber<UInt32>(block, column, result)
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|| executeNumber<UInt64>(block, column, result)
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|| executeNumber<Int8>(block, column, result)
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|| executeNumber<Int16>(block, column, result)
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|| executeNumber<Int32>(block, column, result)
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|| executeNumber<Int64>(block, column, result)
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|| executeNumber<Float32>(block, column, result)
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|| executeNumber<Float64>(block, column, result))
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{
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}
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else if (const ColumnString * col = dynamic_cast<const ColumnString *>(&*column))
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{
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ColumnUInt64 * res = new ColumnUInt64(rows);
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stringWidthVector(dynamic_cast<const ColumnUInt8 &>(col->getData()).getData(), col->getOffsets(), res->getData());
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block.getByPosition(result).column = res;
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}
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else if (const ColumnFixedString * col = dynamic_cast<const ColumnFixedString *>(&*column))
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{
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ColumnUInt64 * res = new ColumnUInt64(rows);
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stringWidthFixedVector(dynamic_cast<const ColumnUInt8 &>(col->getData()).getData(), col->getN(), res->getData());
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block.getByPosition(result).column = res;
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}
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else if (const ColumnConstString * col = dynamic_cast<const ColumnConstString *>(&*column))
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{
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UInt64 res = 0;
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stringWidthConstant(col->getData(), res);
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block.getByPosition(result).column = new ColumnConstUInt64(rows, res);
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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 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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