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70 lines
2.0 KiB
C++
70 lines
2.0 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 LOGICAL_ERROR;
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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 IntExp2Impl
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{
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using ResultType = UInt64;
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static constexpr const bool allow_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>)
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throw DB::Exception("intExp2 not implemented for big integers", ErrorCodes::NOT_IMPLEMENTED);
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else
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return intExp2(a);
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = true;
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static inline llvm::Value * compile(llvm::IRBuilder<> & b, llvm::Value * arg, bool)
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{
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if (!arg->getType()->isIntegerTy())
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throw Exception("IntExp2Impl expected an integral type", ErrorCodes::LOGICAL_ERROR);
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return b.CreateShl(llvm::ConstantInt::get(arg->getType(), 1), arg);
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}
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#endif
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};
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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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struct NameIntExp2 { static constexpr auto name = "intExp2"; };
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using FunctionIntExp2 = FunctionUnaryArithmetic<IntExp2Impl, NameIntExp2, true>;
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}
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template <> struct FunctionUnaryArithmeticMonotonicity<NameIntExp2>
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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 > 63)
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return {};
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return { true };
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}
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};
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void registerFunctionIntExp2(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionIntExp2>();
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}
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}
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