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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionUnaryArithmetic.h>
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#include <Common/FieldVisitorConvertToNumber.h>
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#include <Common/intExp.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NOT_IMPLEMENTED;
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}
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namespace
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{
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template <typename A>
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struct IntExp10Impl
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{
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using ResultType = UInt64;
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static constexpr const bool allow_string_or_fixed_string = false;
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static inline ResultType apply([[maybe_unused]] A a)
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{
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if constexpr (is_big_int_v<A> || std::is_same_v<A, Decimal256>)
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throw DB::Exception(ErrorCodes::NOT_IMPLEMENTED, "IntExp10 is not implemented for big integers");
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else
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return intExp10(static_cast<int>(a));
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = false; /// library function
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#endif
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};
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struct NameIntExp10 { static constexpr auto name = "intExp10"; };
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/// Assumed to be injective for the purpose of query optimization, but in fact it is not injective because of possible overflow.
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using FunctionIntExp10 = FunctionUnaryArithmetic<IntExp10Impl, NameIntExp10, true>;
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}
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template <> struct FunctionUnaryArithmeticMonotonicity<NameIntExp10>
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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()
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? -std::numeric_limits<Float64>::infinity()
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: applyVisitor(FieldVisitorConvertToNumber<Float64>(), left);
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Float64 right_float = right.isNull()
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? std::numeric_limits<Float64>::infinity()
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: applyVisitor(FieldVisitorConvertToNumber<Float64>(), right);
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if (left_float < 0 || right_float > 19)
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return {};
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return { .is_monotonic = true, .is_strict = true };
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}
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};
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REGISTER_FUNCTION(IntExp10)
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{
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factory.registerFunction<FunctionIntExp10>();
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}
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}
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