1 | #include <Functions/FunctionFactory.h> |
---|---|
2 | #include <Functions/FunctionUnaryArithmetic.h> |
3 | #include <DataTypes/NumberTraits.h> |
4 | #include <Common/FieldVisitors.h> |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | template <typename A> |
10 | struct AbsImpl |
11 | { |
12 | using ResultType = std::conditional_t<IsDecimalNumber<A>, A, typename NumberTraits::ResultOfAbs<A>::Type>; |
13 | |
14 | static inline NO_SANITIZE_UNDEFINED ResultType apply(A a) |
15 | { |
16 | if constexpr (IsDecimalNumber<A>) |
17 | return a < 0 ? A(-a) : a; |
18 | else if constexpr (is_integral_v<A> && is_signed_v<A>) |
19 | return a < 0 ? static_cast<ResultType>(~a) + 1 : a; |
20 | else if constexpr (is_integral_v<A> && is_unsigned_v<A>) |
21 | return static_cast<ResultType>(a); |
22 | else if constexpr (std::is_floating_point_v<A>) |
23 | return static_cast<ResultType>(std::abs(a)); |
24 | } |
25 | |
26 | #if USE_EMBEDDED_COMPILER |
27 | static constexpr bool compilable = false; /// special type handling, some other time |
28 | #endif |
29 | }; |
30 | |
31 | struct NameAbs { static constexpr auto name = "abs"; }; |
32 | using FunctionAbs = FunctionUnaryArithmetic<AbsImpl, NameAbs, false>; |
33 | |
34 | template <> struct FunctionUnaryArithmeticMonotonicity<NameAbs> |
35 | { |
36 | static bool has() { return true; } |
37 | static IFunction::Monotonicity get(const Field & left, const Field & right) |
38 | { |
39 | Float64 left_float = left.isNull() ? -std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), left); |
40 | Float64 right_float = right.isNull() ? std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), right); |
41 | |
42 | if ((left_float < 0 && right_float > 0) || (left_float > 0 && right_float < 0)) |
43 | return {}; |
44 | |
45 | return { true, (left_float > 0) }; |
46 | } |
47 | }; |
48 | |
49 | void registerFunctionAbs(FunctionFactory & factory) |
50 | { |
51 | factory.registerFunction<FunctionAbs>(FunctionFactory::CaseInsensitive); |
52 | } |
53 | |
54 | } |
55 |