1#include <Functions/FunctionFactory.h>
2#include <Functions/FunctionUnaryArithmetic.h>
3#include <DataTypes/NumberTraits.h>
4#include <Common/FieldVisitors.h>
5
6namespace DB
7{
8
9template <typename A>
10struct 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
31struct NameAbs { static constexpr auto name = "abs"; };
32using FunctionAbs = FunctionUnaryArithmetic<AbsImpl, NameAbs, false>;
33
34template <> 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
49void registerFunctionAbs(FunctionFactory & factory)
50{
51 factory.registerFunction<FunctionAbs>(FunctionFactory::CaseInsensitive);
52}
53
54}
55