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dbms: add function metroHash64

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This commit is contained in:
Andrey Mironov 2015-07-20 17:59:20 +03:00
parent 348ebf0731
commit 58408dc8a3
2 changed files with 22 additions and 0 deletions
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21
dbms/include/DB/Functions/FunctionsHashing.h
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@ -4,6 +4,7 @@
#include <openssl/sha.h>
#include <city.h>
#include <farmhash.h>
#include <metrohash.h>
#include <Poco/ByteOrder.h>
@ -839,6 +840,25 @@ struct ImplFarmHash64
static auto Hash64(const char * const s, const std::size_t len) { return farmhash::Hash64(s, len); }
};
struct ImplMetroHash64
{
static constexpr auto name = "metroHash64";
using uint128_t = uint128;
static auto Hash128to64(const uint128_t & x) { return ::Hash128to64(x); }
static auto Hash64(const char * const s, const std::size_t len)
{
union {
std::uint64_t u64;
std::uint8_t u8[sizeof(u64)];
};
metrohash64_1(reinterpret_cast<const std::uint8_t *>(s), len, 0, u8);
return u64;
}
};
using FunctionHalfMD5 = FunctionStringHash64<HalfMD5Impl, NameHalfMD5>;
using FunctionSipHash64 = FunctionStringHash64<SipHash64Impl, NameSipHash64>;
using FunctionIntHash32 = FunctionIntHash<IntHash32Impl, NameIntHash32>;
@ -850,5 +870,6 @@ using FunctionSHA256 = FunctionStringHashFixedString<SHA256Impl>;
using FunctionSipHash128 = FunctionStringHashFixedString<SipHash128Impl>;
using FunctionCityHash64 = FunctionNeighbourhoodHash64<ImplCityHash64>;
using FunctionFarmHash64 = FunctionNeighbourhoodHash64<ImplFarmHash64>;
using FunctionMetroHash64 = FunctionNeighbourhoodHash64<ImplMetroHash64>;
}

1
dbms/src/Functions/FunctionsHashing.cpp
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@ -16,6 +16,7 @@ void registerFunctionsHashing(FunctionFactory & factory)
factory.registerFunction<FunctionSipHash128>();
factory.registerFunction<FunctionCityHash64>();
factory.registerFunction<FunctionFarmHash64>();
factory.registerFunction<FunctionMetroHash64>();
factory.registerFunction<FunctionIntHash32>();
factory.registerFunction<FunctionIntHash64>();
factory.registerFunction<FunctionURLHash>();