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100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
#pragma once
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#include <DB/Functions/FunctionsArithmetic.h>
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#include <cmath> // log2()
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namespace DB
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{
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/** Функции округления:
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* roundToExp2 - вниз до ближайшей степени двойки;
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* roundDuration - вниз до ближайшего из: 0, 1, 10, 30, 60, 120, 180, 240, 300, 600, 1200, 1800, 3600, 7200, 18000, 36000;
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* roundAge - вниз до ближайшего из: 0, 18, 25, 35, 45.
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*/
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template<typename A>
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struct RoundToExp2Impl
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{
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typedef A ResultType;
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static inline A apply(A x)
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{
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return x <= 0 ? static_cast<A>(0) : (static_cast<A>(1) << static_cast<UInt64>(log2(static_cast<double>(x))));
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}
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};
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template<>
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struct RoundToExp2Impl<Float32>
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{
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typedef Float32 ResultType;
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static inline Float32 apply(Float32 x)
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{
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return static_cast<Float32>(x < 1 ? 0. : pow(2., floor(log2(x))));
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}
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};
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template<>
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struct RoundToExp2Impl<Float64>
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{
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typedef Float64 ResultType;
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static inline Float64 apply(Float64 x)
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{
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return x < 1 ? 0. : pow(2., floor(log2(x)));
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}
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};
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template<typename A>
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struct RoundDurationImpl
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{
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typedef UInt16 ResultType;
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static inline ResultType apply(A x)
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{
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return x < 1 ? 0
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: (x < 10 ? 1
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: (x < 30 ? 10
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: (x < 60 ? 30
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: (x < 120 ? 60
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: (x < 180 ? 120
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: (x < 240 ? 180
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: (x < 300 ? 240
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: (x < 600 ? 300
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: (x < 1200 ? 600
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: (x < 1800 ? 1200
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: (x < 3600 ? 1800
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: (x < 7200 ? 3600
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: (x < 18000 ? 7200
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: (x < 36000 ? 18000
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: 36000))))))))))))));
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}
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};
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template<typename A>
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struct RoundAgeImpl
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{
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typedef UInt8 ResultType;
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static inline ResultType apply(A x)
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{
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return x < 18 ? 0
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: (x < 25 ? 18
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: (x < 35 ? 25
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: (x < 45 ? 35
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: 45)));
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}
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};
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struct NameRoundToExp2 { static const char * get() { return "roundToExp2"; } };
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struct NameRoundDuration { static const char * get() { return "roundDuration"; } };
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struct NameRoundAge { static const char * get() { return "roundAge"; } };
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typedef FunctionUnaryArithmetic<RoundToExp2Impl, NameRoundToExp2> FunctionRoundToExp2;
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typedef FunctionUnaryArithmetic<RoundDurationImpl, NameRoundDuration> FunctionRoundDuration;
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typedef FunctionUnaryArithmetic<RoundAgeImpl, NameRoundAge> FunctionRoundAge;
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}
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