ClickHouse/src/Functions/intExp10.cpp

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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionUnaryArithmetic.h>
#include <Common/FieldVisitors.h>
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#include <Common/intExp.h>
namespace DB
{
template <typename A>
struct IntExp10Impl
{
using ResultType = UInt64;
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static constexpr const bool allow_fixed_string = false;
static inline ResultType apply(A a)
{
return intExp10(a);
}
#if USE_EMBEDDED_COMPILER
static constexpr bool compilable = false; /// library function
#endif
};
struct NameIntExp10 { static constexpr auto name = "intExp10"; };
/// Assumed to be injective for the purpose of query optimization, but in fact it is not injective because of possible overflow.
using FunctionIntExp10 = FunctionUnaryArithmetic<IntExp10Impl, NameIntExp10, true>;
template <> struct FunctionUnaryArithmeticMonotonicity<NameIntExp10>
{
static bool has() { return true; }
static IFunction::Monotonicity get(const Field & left, const Field & right)
{
Float64 left_float = left.isNull() ? -std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), left);
Float64 right_float = right.isNull() ? std::numeric_limits<Float64>::infinity() : applyVisitor(FieldVisitorConvertToNumber<Float64>(), right);
if (left_float < 0 || right_float > 19)
return {};
return { true };
}
};
void registerFunctionIntExp10(FunctionFactory & factory)
{
factory.registerFunction<FunctionIntExp10>();
}
}