2018-11-26 16:20:40 +00:00
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionUnaryArithmetic.h>
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#include <DataTypes/NumberTraits.h>
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#include <Common/FieldVisitors.h>
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namespace DB
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{
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template <typename A>
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struct AbsImpl
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{
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using ResultType = std::conditional_t<IsDecimalNumber<A>, A, typename NumberTraits::ResultOfAbs<A>::Type>;
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2020-02-14 08:17:32 +00:00
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static const constexpr bool allow_fixed_string = false;
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2018-11-26 16:20:40 +00:00
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2018-12-26 23:55:09 +00:00
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static inline NO_SANITIZE_UNDEFINED ResultType apply(A a)
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2018-11-26 16:20:40 +00:00
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{
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if constexpr (IsDecimalNumber<A>)
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2020-08-19 11:52:17 +00:00
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return a < A(0) ? A(-a) : a;
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else if constexpr (is_big_int_v<A>)
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// from boost/multiprecision/number.hpp
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return static_cast<ResultType>(abs(a));
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else if constexpr (is_integer_v<A> && is_signed_v<A>)
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2018-11-26 16:20:40 +00:00
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return a < 0 ? static_cast<ResultType>(~a) + 1 : a;
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2020-08-19 11:52:17 +00:00
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else if constexpr (is_integer_v<A> && is_unsigned_v<A>)
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2018-11-26 16:20:40 +00:00
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return static_cast<ResultType>(a);
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else if constexpr (std::is_floating_point_v<A>)
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return static_cast<ResultType>(std::abs(a));
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = false; /// special type handling, some other time
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#endif
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};
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struct NameAbs { static constexpr auto name = "abs"; };
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using FunctionAbs = FunctionUnaryArithmetic<AbsImpl, NameAbs, false>;
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template <> struct FunctionUnaryArithmeticMonotonicity<NameAbs>
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{
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static bool has() { return true; }
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static IFunction::Monotonicity get(const Field & left, const Field & right)
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{
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Float64 left_float = left.isNull() ? -std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), left);
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Float64 right_float = right.isNull() ? std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), right);
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if ((left_float < 0 && right_float > 0) || (left_float > 0 && right_float < 0))
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return {};
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return { true, (left_float > 0) };
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}
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};
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void registerFunctionAbs(FunctionFactory & factory)
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{
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2018-12-19 14:46:18 +00:00
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factory.registerFunction<FunctionAbs>(FunctionFactory::CaseInsensitive);
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2018-11-26 16:20:40 +00:00
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}
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}
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