mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-23 16:12:01 +00:00
100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
#pragma once
|
|
|
|
#include <DB/Functions/FunctionsArithmetic.h>
|
|
#include <cmath> // log2()
|
|
|
|
|
|
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.
|
|
*/
|
|
|
|
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)));
|
|
}
|
|
};
|
|
|
|
|
|
struct NameRoundToExp2 { static constexpr auto name = "roundToExp2"; };
|
|
struct NameRoundDuration { static constexpr auto name = "roundDuration"; };
|
|
struct NameRoundAge { static constexpr auto name = "roundAge"; };
|
|
|
|
typedef FunctionUnaryArithmetic<RoundToExp2Impl, NameRoundToExp2> FunctionRoundToExp2;
|
|
typedef FunctionUnaryArithmetic<RoundDurationImpl, NameRoundDuration> FunctionRoundDuration;
|
|
typedef FunctionUnaryArithmetic<RoundAgeImpl, NameRoundAge> FunctionRoundAge;
|
|
|
|
}
|