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36 lines
1021 B
C++
36 lines
1021 B
C++
#include <Functions/FunctionBinaryArithmetic.h>
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#include <Functions/FunctionFactory.h>
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namespace DB
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{
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template <typename A, typename B>
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struct BitHammingDistanceImpl
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{
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using ResultType = UInt8;
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static const constexpr bool allow_fixed_string = false;
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static const constexpr bool allow_string_integer = false;
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template <typename Result = ResultType>
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static inline NO_SANITIZE_UNDEFINED Result apply(A a, B b)
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{
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UInt64 res = static_cast<UInt64>(a) ^ static_cast<UInt64>(b);
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return __builtin_popcountll(res);
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = false; /// special type handling, some other time
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#endif
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};
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struct NameBitHammingDistance
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{
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static constexpr auto name = "bitHammingDistance";
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};
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using FunctionBitHammingDistance = BinaryArithmeticOverloadResolver<BitHammingDistanceImpl, NameBitHammingDistance>;
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void registerFunctionBitHammingDistance(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionBitHammingDistance>();
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}
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}
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