ClickHouse

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#include <Functions/FunctionMathUnary.h>
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#include <Functions/FunctionFactory.h>
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namespace DB
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{
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namespace
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{
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struct LogName { static constexpr auto name = "log"; };
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#if USE_FASTOPS
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    struct Impl
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    {
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        static constexpr auto name = LogName::name;
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        static constexpr auto rows_per_iteration = 0;
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        static constexpr bool always_returns_float64 = false;
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        template <typename T>
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        static void execute(const T * src, size_t size, T * dst)
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        {
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            NFastOps::Log<true>(src, size, dst);
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        }
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    };
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using FunctionLog = FunctionMathUnary<Impl>;
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#else
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using FunctionLog = FunctionMathUnary<UnaryFunctionVectorized<LogName, log>>;
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#endif
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}
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REGISTER_FUNCTION(Log)
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{
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    factory.registerFunction<FunctionLog>({}, FunctionFactory::CaseInsensitive);
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    factory.registerAlias("ln", "log", FunctionFactory::CaseInsensitive);
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}
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}
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