mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-24 18:50:49 +00:00
458 lines
13 KiB
C++
458 lines
13 KiB
C++
#pragma once
|
||
|
||
#include <DB/Functions/FunctionsArithmetic.h>
|
||
#include <cmath>
|
||
#include <type_traits>
|
||
#include <array>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
/** Функции округления:
|
||
* roundToExp2 - вниз до ближайшей степени двойки;
|
||
* roundDuration - вниз до ближайшего из: 0, 1, 10, 30, 60, 120, 180, 240, 300, 600, 1200, 1800, 3600, 7200, 18000, 36000;
|
||
* roundAge - вниз до ближайшего из: 0, 18, 25, 35, 45.
|
||
* round(x, N) - арифметическое округление (N - сколько знаков после запятой оставить; 0 по умолчанию).
|
||
* ceil(x, N) - наименьшее число, которое не меньше x (N - сколько знаков после запятой оставить; 0 по умолчанию).
|
||
* floor(x, N) - наибольшее число, которое не больше x (N - сколько знаков после запятой оставить; 0 по умолчанию).
|
||
*/
|
||
|
||
template<typename A>
|
||
struct RoundToExp2Impl
|
||
{
|
||
typedef A ResultType;
|
||
|
||
static inline A apply(A x)
|
||
{
|
||
return x <= 0 ? static_cast<A>(0) : (static_cast<A>(1) << static_cast<UInt64>(log2(static_cast<double>(x))));
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct RoundToExp2Impl<Float32>
|
||
{
|
||
typedef Float32 ResultType;
|
||
|
||
static inline Float32 apply(Float32 x)
|
||
{
|
||
return static_cast<Float32>(x < 1 ? 0. : pow(2., floor(log2(x))));
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct RoundToExp2Impl<Float64>
|
||
{
|
||
typedef Float64 ResultType;
|
||
|
||
static inline Float64 apply(Float64 x)
|
||
{
|
||
return x < 1 ? 0. : pow(2., floor(log2(x)));
|
||
}
|
||
};
|
||
|
||
template<typename A>
|
||
struct RoundDurationImpl
|
||
{
|
||
typedef UInt16 ResultType;
|
||
|
||
static inline ResultType apply(A x)
|
||
{
|
||
return x < 1 ? 0
|
||
: (x < 10 ? 1
|
||
: (x < 30 ? 10
|
||
: (x < 60 ? 30
|
||
: (x < 120 ? 60
|
||
: (x < 180 ? 120
|
||
: (x < 240 ? 180
|
||
: (x < 300 ? 240
|
||
: (x < 600 ? 300
|
||
: (x < 1200 ? 600
|
||
: (x < 1800 ? 1200
|
||
: (x < 3600 ? 1800
|
||
: (x < 7200 ? 3600
|
||
: (x < 18000 ? 7200
|
||
: (x < 36000 ? 18000
|
||
: 36000))))))))))))));
|
||
}
|
||
};
|
||
|
||
template<typename A>
|
||
struct RoundAgeImpl
|
||
{
|
||
typedef UInt8 ResultType;
|
||
|
||
static inline ResultType apply(A x)
|
||
{
|
||
return x < 18 ? 0
|
||
: (x < 25 ? 18
|
||
: (x < 35 ? 25
|
||
: (x < 45 ? 35
|
||
: 45)));
|
||
}
|
||
};
|
||
|
||
template<typename T, template<typename> class Op, typename PowersTable>
|
||
struct FunctionApproximatingImpl
|
||
{
|
||
template <typename U = T>
|
||
static inline U apply(U val, UInt8 precision,
|
||
typename std::enable_if<std::is_floating_point<U>::value>::type * = nullptr)
|
||
{
|
||
if (val == 0)
|
||
return val;
|
||
else
|
||
{
|
||
size_t power = PowersTable::values[precision];
|
||
return Op<U>::apply(val * power) / power;
|
||
}
|
||
}
|
||
|
||
/// Для целых чисел ничего не надо делать.
|
||
template <typename U = T>
|
||
static inline U apply(U val, UInt8 precision,
|
||
typename std::enable_if<std::is_integral<U>::value>::type * = nullptr)
|
||
{
|
||
return val;
|
||
}
|
||
};
|
||
|
||
template<typename T, typename U>
|
||
struct PrecisionForType
|
||
{
|
||
template<typename L = T>
|
||
static inline bool apply(const ColumnPtr & column, UInt8 & precision,
|
||
typename std::enable_if<std::is_floating_point<L>::value>::type * = nullptr)
|
||
{
|
||
using ColumnType = ColumnConst<U>;
|
||
|
||
const ColumnType * precision_col = typeid_cast<const ColumnType *>(&*column);
|
||
if (precision_col == nullptr)
|
||
return false;
|
||
|
||
U val = precision_col->getData();
|
||
if (val < 0)
|
||
val = 0;
|
||
else if (val >= static_cast<U>(std::numeric_limits<L>::digits10))
|
||
val = static_cast<U>(std::numeric_limits<L>::digits10);
|
||
|
||
precision = static_cast<UInt8>(val);
|
||
|
||
return true;
|
||
}
|
||
|
||
/// Для целых чисел точность не имеет значения.
|
||
template<typename L = T>
|
||
static inline bool apply(const ColumnPtr & column, UInt8 & precision,
|
||
typename std::enable_if<std::is_integral<L>::value>::type * = nullptr)
|
||
{
|
||
using ColumnType = ColumnConst<U>;
|
||
|
||
const ColumnType * precision_col = typeid_cast<const ColumnType *>(&*column);
|
||
if (precision_col == nullptr)
|
||
return false;
|
||
|
||
precision = 0;
|
||
|
||
return true;
|
||
}
|
||
};
|
||
|
||
/// Следующий код генерирует во время сборки таблицу степеней числа 10.
|
||
|
||
namespace
|
||
{
|
||
/// Отдельные степени числа 10.
|
||
|
||
template <size_t N>
|
||
struct PowerOf10
|
||
{
|
||
static const size_t value = 10 * PowerOf10<N - 1>::value;
|
||
};
|
||
|
||
template<>
|
||
struct PowerOf10<0>
|
||
{
|
||
static const size_t value = 1;
|
||
};
|
||
}
|
||
|
||
/// Объявление и определение контейнера содержащего таблицу степеней числа 10.
|
||
|
||
template <size_t... TArgs>
|
||
struct TableContainer
|
||
{
|
||
static const std::array<size_t, sizeof...(TArgs)> values;
|
||
};
|
||
|
||
template <size_t... TArgs>
|
||
const std::array<size_t, sizeof...(TArgs)> TableContainer<TArgs...>::values = { TArgs... };
|
||
|
||
/// Генератор первых N степеней.
|
||
|
||
template <size_t N, size_t... TArgs>
|
||
struct FillArrayImpl
|
||
{
|
||
using result = typename FillArrayImpl<N - 1, PowerOf10<N>::value, TArgs...>::result;
|
||
};
|
||
|
||
template <size_t... TArgs>
|
||
struct FillArrayImpl<0, TArgs...>
|
||
{
|
||
using result = TableContainer<PowerOf10<0>::value, TArgs...>;
|
||
};
|
||
|
||
template <size_t N>
|
||
struct FillArray
|
||
{
|
||
using result = typename FillArrayImpl<N-1>::result;
|
||
};
|
||
|
||
/** Шаблон для функцией, которые вычисляют приближенное значение входного параметра
|
||
* типа (U)Int8/16/32/64 или Float32/64 и принимают дополнительный необязятельный
|
||
* параметр указывающий сколько знаков после запятой оставить (по умолчанию - 0).
|
||
* Op - функция (round/floor/ceil)
|
||
*/
|
||
template<template<typename> class Op, typename Name>
|
||
class FunctionApproximating : public IFunction
|
||
{
|
||
public:
|
||
static constexpr auto name = Name::name;
|
||
static IFunction * create(const Context & context) { return new FunctionApproximating; }
|
||
|
||
private:
|
||
using PowersOf10 = FillArray<std::numeric_limits<DB::Float64>::digits10 + 1>::result;
|
||
|
||
private:
|
||
template<typename T>
|
||
bool checkType(const IDataType * type) const
|
||
{
|
||
return typeid_cast<const T *>(type) != nullptr;
|
||
}
|
||
|
||
template<typename T>
|
||
bool executeForType(Block & block, const ColumnNumbers & arguments, size_t result)
|
||
{
|
||
if (ColumnVector<T> * col = typeid_cast<ColumnVector<T> *>(&*block.getByPosition(arguments[0]).column))
|
||
{
|
||
UInt8 precision = 0;
|
||
if (arguments.size() == 2)
|
||
precision = getPrecision<T>(block.getByPosition(arguments[1]).column);
|
||
|
||
ColumnVector<T> * col_res = new ColumnVector<T>;
|
||
block.getByPosition(result).column = col_res;
|
||
|
||
typename ColumnVector<T>::Container_t & vec_res = col_res->getData();
|
||
vec_res.resize(col->getData().size());
|
||
|
||
const PODArray<T> & a = col->getData();
|
||
size_t size = a.size();
|
||
for (size_t i = 0; i < size; ++i)
|
||
vec_res[i] = FunctionApproximatingImpl<T, Op, PowersOf10>::apply(a[i], precision);
|
||
|
||
return true;
|
||
}
|
||
else if (ColumnConst<T> * col = typeid_cast<ColumnConst<T> *>(&*block.getByPosition(arguments[0]).column))
|
||
{
|
||
UInt8 precision = 0;
|
||
if (arguments.size() == 2)
|
||
precision = getPrecision<T>(block.getByPosition(arguments[1]).column);
|
||
|
||
T res = FunctionApproximatingImpl<T, Op, PowersOf10>::apply(col->getData(), precision);
|
||
|
||
ColumnConst<T> * col_res = new ColumnConst<T>(col->size(), res);
|
||
block.getByPosition(result).column = col_res;
|
||
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/// В зависимости от входного параметра, определить какая нужна точность
|
||
/// для результата.
|
||
template<typename T>
|
||
UInt8 getPrecision(const ColumnPtr & column)
|
||
{
|
||
UInt8 precision = 0;
|
||
|
||
if (!( PrecisionForType<T, UInt8>::apply(column, precision)
|
||
|| PrecisionForType<T, UInt16>::apply(column, precision)
|
||
|| PrecisionForType<T, UInt16>::apply(column, precision)
|
||
|| PrecisionForType<T, UInt32>::apply(column, precision)
|
||
|| PrecisionForType<T, UInt64>::apply(column, precision)
|
||
|| PrecisionForType<T, Int8>::apply(column, precision)
|
||
|| PrecisionForType<T, Int16>::apply(column, precision)
|
||
|| PrecisionForType<T, Int32>::apply(column, precision)
|
||
|| PrecisionForType<T, Int64>::apply(column, precision)))
|
||
{
|
||
throw Exception("Illegal column " + column->getName()
|
||
+ " of second ('precision') argument of function " + getName(),
|
||
ErrorCodes::ILLEGAL_COLUMN);
|
||
}
|
||
|
||
return precision;
|
||
}
|
||
|
||
public:
|
||
/// Получить имя функции.
|
||
String getName() const override
|
||
{
|
||
return name;
|
||
}
|
||
|
||
/// Получить типы результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
|
||
DataTypePtr getReturnType(const DataTypes & arguments) const override
|
||
{
|
||
if ((arguments.size() < 1) || (arguments.size() > 2))
|
||
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
|
||
+ toString(arguments.size()) + ", should be 1 or 2.",
|
||
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
|
||
|
||
if (arguments.size() == 2)
|
||
{
|
||
const IDataType * type = &*arguments[1];
|
||
if (!( checkType<DataTypeUInt8>(type)
|
||
|| checkType<DataTypeUInt16>(type)
|
||
|| checkType<DataTypeUInt32>(type)
|
||
|| checkType<DataTypeUInt64>(type)
|
||
|| checkType<DataTypeInt8>(type)
|
||
|| checkType<DataTypeInt16>(type)
|
||
|| checkType<DataTypeInt32>(type)
|
||
|| checkType<DataTypeInt64>(type)))
|
||
{
|
||
throw Exception("Illegal type in second argument of function " + getName(),
|
||
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
||
}
|
||
}
|
||
|
||
const IDataType * type = &*arguments[0];
|
||
if (!type->behavesAsNumber())
|
||
throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
|
||
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
||
|
||
return arguments[0];
|
||
}
|
||
|
||
/// Выполнить функцию над блоком.
|
||
void execute(Block & block, const ColumnNumbers & arguments, size_t result) override
|
||
{
|
||
if (!( executeForType<UInt8>(block, arguments, result)
|
||
|| executeForType<UInt16>(block, arguments, result)
|
||
|| executeForType<UInt32>(block, arguments, result)
|
||
|| executeForType<UInt64>(block, arguments, result)
|
||
|| executeForType<Int8>(block, arguments, result)
|
||
|| executeForType<Int16>(block, arguments, result)
|
||
|| executeForType<Int32>(block, arguments, result)
|
||
|| executeForType<Int64>(block, arguments, result)
|
||
|| executeForType<Float32>(block, arguments, result)
|
||
|| executeForType<Float64>(block, arguments, result)))
|
||
{
|
||
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
|
||
+ " of argument of function " + getName(),
|
||
ErrorCodes::ILLEGAL_COLUMN);
|
||
}
|
||
}
|
||
};
|
||
|
||
namespace
|
||
{
|
||
/// Определение функцией для использования в шаблоне FunctionApproximating.
|
||
|
||
template<typename T>
|
||
struct RoundImpl
|
||
{
|
||
static inline T apply(T val)
|
||
{
|
||
return val;
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct RoundImpl<DB::Float32>
|
||
{
|
||
static inline DB::Float32 apply(DB::Float32 val)
|
||
{
|
||
return roundf(val);
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct RoundImpl<DB::Float64>
|
||
{
|
||
static inline DB::Float64 apply(DB::Float64 val)
|
||
{
|
||
return round(val);
|
||
}
|
||
};
|
||
|
||
template<typename T>
|
||
struct CeilImpl
|
||
{
|
||
static inline T apply(T val)
|
||
{
|
||
return val;
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct CeilImpl<DB::Float32>
|
||
{
|
||
static inline DB::Float32 apply(DB::Float32 val)
|
||
{
|
||
return ceilf(val);
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct CeilImpl<DB::Float64>
|
||
{
|
||
static inline DB::Float64 apply(DB::Float64 val)
|
||
{
|
||
return ceil(val);
|
||
}
|
||
};
|
||
|
||
template<typename T>
|
||
struct FloorImpl
|
||
{
|
||
static inline T apply(T val)
|
||
{
|
||
return val;
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct FloorImpl<DB::Float32>
|
||
{
|
||
static inline DB::Float32 apply(DB::Float32 val)
|
||
{
|
||
return floorf(val);
|
||
}
|
||
};
|
||
|
||
template<>
|
||
struct FloorImpl<DB::Float64>
|
||
{
|
||
static inline DB::Float64 apply(DB::Float64 val)
|
||
{
|
||
return floor(val);
|
||
}
|
||
};
|
||
}
|
||
|
||
struct NameRoundToExp2 { static constexpr auto name = "roundToExp2"; };
|
||
struct NameRoundDuration { static constexpr auto name = "roundDuration"; };
|
||
struct NameRoundAge { static constexpr auto name = "roundAge"; };
|
||
struct NameRound { static constexpr auto name = "round"; };
|
||
struct NameCeil { static constexpr auto name = "ceil"; };
|
||
struct NameFloor { static constexpr auto name = "floor"; };
|
||
|
||
typedef FunctionUnaryArithmetic<RoundToExp2Impl, NameRoundToExp2> FunctionRoundToExp2;
|
||
typedef FunctionUnaryArithmetic<RoundDurationImpl, NameRoundDuration> FunctionRoundDuration;
|
||
typedef FunctionUnaryArithmetic<RoundAgeImpl, NameRoundAge> FunctionRoundAge;
|
||
typedef FunctionApproximating<RoundImpl, NameRound> FunctionRound;
|
||
typedef FunctionApproximating<CeilImpl, NameCeil> FunctionCeil;
|
||
typedef FunctionApproximating<FloorImpl, NameFloor> FunctionFloor;
|
||
}
|