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 Log2Name { static constexpr auto name = "log2"; };
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using FunctionLog2 = FunctionMathUnary<UnaryFunctionVectorized<Log2Name, log2>>;
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}
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REGISTER_FUNCTION(Log2)
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{
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    factory.registerFunction<FunctionLog2>({}, FunctionFactory::CaseInsensitive);
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}
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}
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