ClickHouse

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#include <Functions/FunctionMathUnary.h>
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#include <Functions/FunctionFactory.h>
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#if defined(OS_DARWIN)
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extern "C"
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{
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    double lgamma_r(double x, int * signgamp);
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}
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#endif
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namespace DB
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{
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namespace
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{
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/// Use wrapper and use lgamma_r version because std::lgamma is not threadsafe.
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Float64 lgamma_wrapper(Float64 arg)
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{
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    int signp;
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    return lgamma_r(arg, &signp);
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}
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struct LGammaName { static constexpr auto name = "lgamma"; };
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using FunctionLGamma = FunctionMathUnary<UnaryFunctionVectorized<LGammaName, lgamma_wrapper>>;
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}
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REGISTER_FUNCTION(LGamma)
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{
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    factory.registerFunction<FunctionLGamma>();
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}
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}
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