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 AtanName { static constexpr auto name = "atan"; };
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using FunctionAtan = FunctionMathUnary<UnaryFunctionVectorized<AtanName, atan>>;
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}
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REGISTER_FUNCTION(Atan)
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{
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    factory.registerFunction<FunctionAtan>({}, FunctionFactory::CaseInsensitive);
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}
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}
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