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ClickHouse/src/Functions/FunctionsHashing.h
Anton Popov 45da56d802 support hash functions with Map type
2022-07-28 19:15:19 +00:00

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#pragma once
#include <city.h>
#include <farmhash.h>
#include <metrohash.h>
#include <MurmurHash2.h>
#include <MurmurHash3.h>
#include <wyhash.h>
#include "config_functions.h"
#include "config_core.h"
#include <Common/SipHash.h>
#include <Common/typeid_cast.h>
#include <Common/HashTable/Hash.h>
#include <xxhash.h>
#if USE_SSL
# include <openssl/md4.h>
# include <openssl/md5.h>
# include <openssl/sha.h>
#endif
#include <Poco/ByteOrder.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypesDecimal.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeFixedString.h>
#include <DataTypes/DataTypeEnum.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeMap.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnMap.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/PerformanceAdaptors.h>
#include <Common/TargetSpecific.h>
#include <base/range.h>
#include <base/bit_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int BAD_ARGUMENTS;
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int NOT_IMPLEMENTED;
extern const int ILLEGAL_COLUMN;
}
/** Hashing functions.
*
* halfMD5: String -> UInt64
*
* A faster cryptographic hash function:
* sipHash64: String -> UInt64
*
* Fast non-cryptographic hash function for strings:
* cityHash64: String -> UInt64
*
* A non-cryptographic hashes from a tuple of values of any types (uses respective function for strings and intHash64 for numbers):
* cityHash64: any* -> UInt64
* sipHash64: any* -> UInt64
* halfMD5: any* -> UInt64
*
* Fast non-cryptographic hash function from any integer:
* intHash32: number -> UInt32
* intHash64: number -> UInt64
*
*/
struct IntHash32Impl
{
using ReturnType = UInt32;
static UInt32 apply(UInt64 x)
{
/// seed is taken from /dev/urandom. It allows you to avoid undesirable dependencies with hashes in different data structures.
return intHash32<0x75D9543DE018BF45ULL>(x);
}
};
struct IntHash64Impl
{
using ReturnType = UInt64;
static UInt64 apply(UInt64 x)
{
return intHash64(x ^ 0x4CF2D2BAAE6DA887ULL);
}
};
template<typename T, typename HashFunction>
T combineHashesFunc(T t1, T t2)
{
T hashes[] = {t1, t2};
return HashFunction::apply(reinterpret_cast<const char *>(hashes), 2 * sizeof(T));
}
#if USE_SSL
struct HalfMD5Impl
{
static constexpr auto name = "halfMD5";
using ReturnType = UInt64;
static UInt64 apply(const char * begin, size_t size)
{
union
{
unsigned char char_data[16];
uint64_t uint64_data;
} buf;
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
MD5_Final(buf.char_data, &ctx);
return Poco::ByteOrder::flipBytes(static_cast<Poco::UInt64>(buf.uint64_data)); /// Compatibility with existing code. Cast need for old poco AND macos where UInt64 != uint64_t
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
UInt64 hashes[] = {h1, h2};
return apply(reinterpret_cast<const char *>(hashes), 16);
}
/// If true, it will use intHash32 or intHash64 to hash POD types. This behaviour is intended for better performance of some functions.
/// Otherwise it will hash bytes in memory as a string using corresponding hash function.
static constexpr bool use_int_hash_for_pods = false;
};
struct MD4Impl
{
static constexpr auto name = "MD4";
enum { length = MD4_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
MD4_CTX ctx;
MD4_Init(&ctx);
MD4_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
MD4_Final(out_char_data, &ctx);
}
};
struct MD5Impl
{
static constexpr auto name = "MD5";
enum { length = MD5_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
MD5_Final(out_char_data, &ctx);
}
};
struct SHA1Impl
{
static constexpr auto name = "SHA1";
enum { length = SHA_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
SHA_CTX ctx;
SHA1_Init(&ctx);
SHA1_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
SHA1_Final(out_char_data, &ctx);
}
};
struct SHA224Impl
{
static constexpr auto name = "SHA224";
enum { length = SHA224_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
SHA256_CTX ctx;
SHA224_Init(&ctx);
SHA224_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
SHA224_Final(out_char_data, &ctx);
}
};
struct SHA256Impl
{
static constexpr auto name = "SHA256";
enum { length = SHA256_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
SHA256_CTX ctx;
SHA256_Init(&ctx);
SHA256_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
SHA256_Final(out_char_data, &ctx);
}
};
struct SHA384Impl
{
static constexpr auto name = "SHA384";
enum { length = SHA384_DIGEST_LENGTH };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
SHA512_CTX ctx;
SHA384_Init(&ctx);
SHA384_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
SHA384_Final(out_char_data, &ctx);
}
};
struct SHA512Impl
{
static constexpr auto name = "SHA512";
enum { length = 64 };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
SHA512_CTX ctx;
SHA512_Init(&ctx);
SHA512_Update(&ctx, reinterpret_cast<const unsigned char *>(begin), size);
SHA512_Final(out_char_data, &ctx);
}
};
#endif
struct SipHash64Impl
{
static constexpr auto name = "sipHash64";
using ReturnType = UInt64;
static UInt64 apply(const char * begin, size_t size)
{
return sipHash64(begin, size);
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
return combineHashesFunc<UInt64, SipHash64Impl>(h1, h2);
}
static constexpr bool use_int_hash_for_pods = false;
};
struct SipHash128Impl
{
static constexpr auto name = "sipHash128";
using ReturnType = UInt128;
static UInt128 combineHashes(UInt128 h1, UInt128 h2)
{
return combineHashesFunc<UInt128, SipHash128Impl>(h1, h2);
}
static UInt128 apply(const char * data, const size_t size)
{
return sipHash128(data, size);
}
static constexpr bool use_int_hash_for_pods = false;
};
/** Why we need MurmurHash2?
* MurmurHash2 is an outdated hash function, superseded by MurmurHash3 and subsequently by CityHash, xxHash, HighwayHash.
* Usually there is no reason to use MurmurHash.
* It is needed for the cases when you already have MurmurHash in some applications and you want to reproduce it
* in ClickHouse as is. For example, it is needed to reproduce the behaviour
* for NGINX a/b testing module: https://nginx.ru/en/docs/http/ngx_http_split_clients_module.html
*/
struct MurmurHash2Impl32
{
static constexpr auto name = "murmurHash2_32";
using ReturnType = UInt32;
static UInt32 apply(const char * data, const size_t size)
{
return MurmurHash2(data, size, 0);
}
static UInt32 combineHashes(UInt32 h1, UInt32 h2)
{
return IntHash32Impl::apply(h1) ^ h2;
}
static constexpr bool use_int_hash_for_pods = false;
};
struct MurmurHash2Impl64
{
static constexpr auto name = "murmurHash2_64";
using ReturnType = UInt64;
static UInt64 apply(const char * data, const size_t size)
{
return MurmurHash64A(data, size, 0);
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
return IntHash64Impl::apply(h1) ^ h2;
}
static constexpr bool use_int_hash_for_pods = false;
};
/// To be compatible with gcc: https://github.com/gcc-mirror/gcc/blob/41d6b10e96a1de98e90a7c0378437c3255814b16/libstdc%2B%2B-v3/include/bits/functional_hash.h#L191
struct GccMurmurHashImpl
{
static constexpr auto name = "gccMurmurHash";
using ReturnType = UInt64;
static UInt64 apply(const char * data, const size_t size)
{
return MurmurHash64A(data, size, 0xc70f6907UL);
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
return IntHash64Impl::apply(h1) ^ h2;
}
static constexpr bool use_int_hash_for_pods = false;
};
struct MurmurHash3Impl32
{
static constexpr auto name = "murmurHash3_32";
using ReturnType = UInt32;
static UInt32 apply(const char * data, const size_t size)
{
union
{
UInt32 h;
char bytes[sizeof(h)];
};
MurmurHash3_x86_32(data, size, 0, bytes);
return h;
}
static UInt32 combineHashes(UInt32 h1, UInt32 h2)
{
return IntHash32Impl::apply(h1) ^ h2;
}
static constexpr bool use_int_hash_for_pods = false;
};
struct MurmurHash3Impl64
{
static constexpr auto name = "murmurHash3_64";
using ReturnType = UInt64;
static UInt64 apply(const char * data, const size_t size)
{
union
{
UInt64 h[2];
char bytes[16];
};
MurmurHash3_x64_128(data, size, 0, bytes);
return h[0] ^ h[1];
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
return IntHash64Impl::apply(h1) ^ h2;
}
static constexpr bool use_int_hash_for_pods = false;
};
struct MurmurHash3Impl128
{
static constexpr auto name = "murmurHash3_128";
using ReturnType = UInt128;
static UInt128 apply(const char * data, const size_t size)
{
char bytes[16];
MurmurHash3_x64_128(data, size, 0, bytes);
return *reinterpret_cast<UInt128 *>(bytes);
}
static UInt128 combineHashes(UInt128 h1, UInt128 h2)
{
return combineHashesFunc<UInt128, MurmurHash3Impl128>(h1, h2);
}
static constexpr bool use_int_hash_for_pods = false;
};
/// http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/478a4add975b/src/share/classes/java/lang/String.java#l1452
/// Care should be taken to do all calculation in unsigned integers (to avoid undefined behaviour on overflow)
/// but obtain the same result as it is done in signed integers with two's complement arithmetic.
struct JavaHashImpl
{
static constexpr auto name = "javaHash";
using ReturnType = Int32;
static Int32 apply(const char * data, const size_t size)
{
UInt32 h = 0;
for (size_t i = 0; i < size; ++i)
h = 31 * h + static_cast<UInt32>(static_cast<Int8>(data[i]));
return static_cast<Int32>(h);
}
static Int32 combineHashes(Int32, Int32)
{
throw Exception("Java hash is not combineable for multiple arguments", ErrorCodes::NOT_IMPLEMENTED);
}
static constexpr bool use_int_hash_for_pods = false;
};
struct JavaHashUTF16LEImpl
{
static constexpr auto name = "javaHashUTF16LE";
using ReturnType = Int32;
static Int32 apply(const char * raw_data, const size_t raw_size)
{
char * data = const_cast<char *>(raw_data);
size_t size = raw_size;
// Remove Byte-order-mark(0xFFFE) for UTF-16LE
if (size >= 2 && data[0] == '\xFF' && data[1] == '\xFE')
{
data += 2;
size -= 2;
}
if (size % 2 != 0)
throw Exception("Arguments for javaHashUTF16LE must be in the form of UTF-16", ErrorCodes::BAD_ARGUMENTS);
UInt32 h = 0;
for (size_t i = 0; i < size; i += 2)
h = 31 * h + static_cast<UInt16>(static_cast<UInt8>(data[i]) | static_cast<UInt8>(data[i + 1]) << 8);
return static_cast<Int32>(h);
}
static Int32 combineHashes(Int32, Int32)
{
throw Exception("Java hash is not combineable for multiple arguments", ErrorCodes::NOT_IMPLEMENTED);
}
static constexpr bool use_int_hash_for_pods = false;
};
/// This is just JavaHash with zeroed out sign bit.
/// This function is used in Hive for versions before 3.0,
/// after 3.0, Hive uses murmur-hash3.
struct HiveHashImpl
{
static constexpr auto name = "hiveHash";
using ReturnType = Int32;
static Int32 apply(const char * data, const size_t size)
{
return static_cast<Int32>(0x7FFFFFFF & static_cast<UInt32>(JavaHashImpl::apply(data, size)));
}
static Int32 combineHashes(Int32, Int32)
{
throw Exception("Hive hash is not combineable for multiple arguments", ErrorCodes::NOT_IMPLEMENTED);
}
static constexpr bool use_int_hash_for_pods = false;
};
struct ImplCityHash64
{
static constexpr auto name = "cityHash64";
using ReturnType = UInt64;
using uint128_t = CityHash_v1_0_2::uint128;
static auto combineHashes(UInt64 h1, UInt64 h2) { return CityHash_v1_0_2::Hash128to64(uint128_t(h1, h2)); }
static auto apply(const char * s, const size_t len) { return CityHash_v1_0_2::CityHash64(s, len); }
static constexpr bool use_int_hash_for_pods = true;
};
// see farmhash.h for definition of NAMESPACE_FOR_HASH_FUNCTIONS
struct ImplFarmFingerprint64
{
static constexpr auto name = "farmFingerprint64";
using ReturnType = UInt64;
using uint128_t = NAMESPACE_FOR_HASH_FUNCTIONS::uint128_t;
static auto combineHashes(UInt64 h1, UInt64 h2) { return NAMESPACE_FOR_HASH_FUNCTIONS::Fingerprint(uint128_t(h1, h2)); }
static auto apply(const char * s, const size_t len) { return NAMESPACE_FOR_HASH_FUNCTIONS::Fingerprint64(s, len); }
static constexpr bool use_int_hash_for_pods = true;
};
// see farmhash.h for definition of NAMESPACE_FOR_HASH_FUNCTIONS
struct ImplFarmHash64
{
static constexpr auto name = "farmHash64";
using ReturnType = UInt64;
using uint128_t = NAMESPACE_FOR_HASH_FUNCTIONS::uint128_t;
static auto combineHashes(UInt64 h1, UInt64 h2) { return NAMESPACE_FOR_HASH_FUNCTIONS::Hash128to64(uint128_t(h1, h2)); }
static auto apply(const char * s, const size_t len) { return NAMESPACE_FOR_HASH_FUNCTIONS::Hash64(s, len); }
static constexpr bool use_int_hash_for_pods = true;
};
struct ImplMetroHash64
{
static constexpr auto name = "metroHash64";
using ReturnType = UInt64;
using uint128_t = CityHash_v1_0_2::uint128;
static auto combineHashes(UInt64 h1, UInt64 h2) { return CityHash_v1_0_2::Hash128to64(uint128_t(h1, h2)); }
static auto apply(const char * s, const size_t len)
{
union
{
UInt64 u64;
uint8_t u8[sizeof(u64)];
};
metrohash64_1(reinterpret_cast<const uint8_t *>(s), len, 0, u8);
return u64;
}
static constexpr bool use_int_hash_for_pods = true;
};
struct ImplXxHash32
{
static constexpr auto name = "xxHash32";
using ReturnType = UInt32;
static auto apply(const char * s, const size_t len) { return XXH32(s, len, 0); }
/**
* With current implementation with more than 1 arguments it will give the results
* non-reproducible from outside of CH.
*
* Proper way of combining several input is to use streaming mode of hash function
* https://github.com/Cyan4973/xxHash/issues/114#issuecomment-334908566
*
* In common case doable by init_state / update_state / finalize_state
*/
static auto combineHashes(UInt32 h1, UInt32 h2) { return IntHash32Impl::apply(h1) ^ h2; }
static constexpr bool use_int_hash_for_pods = false;
};
struct ImplXxHash64
{
static constexpr auto name = "xxHash64";
using ReturnType = UInt64;
using uint128_t = CityHash_v1_0_2::uint128;
static auto apply(const char * s, const size_t len) { return XXH64(s, len, 0); }
/*
With current implementation with more than 1 arguments it will give the results
non-reproducible from outside of CH. (see comment on ImplXxHash32).
*/
static auto combineHashes(UInt64 h1, UInt64 h2) { return CityHash_v1_0_2::Hash128to64(uint128_t(h1, h2)); }
static constexpr bool use_int_hash_for_pods = false;
};
template <typename Impl>
class FunctionStringHashFixedString : public IFunction
{
public:
static constexpr auto name = Impl::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringHashFixedString>(); }
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isStringOrFixedString(arguments[0]))
throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeFixedString>(Impl::length);
}
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
if (const ColumnString * col_from = checkAndGetColumn<ColumnString>(arguments[0].column.get()))
{
auto col_to = ColumnFixedString::create(Impl::length);
const typename ColumnString::Chars & data = col_from->getChars();
const typename ColumnString::Offsets & offsets = col_from->getOffsets();
auto & chars_to = col_to->getChars();
const auto size = offsets.size();
chars_to.resize(size * Impl::length);
ColumnString::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
Impl::apply(
reinterpret_cast<const char *>(&data[current_offset]),
offsets[i] - current_offset - 1,
reinterpret_cast<uint8_t *>(&chars_to[i * Impl::length]));
current_offset = offsets[i];
}
return col_to;
}
else if (
const ColumnFixedString * col_from_fix = checkAndGetColumn<ColumnFixedString>(arguments[0].column.get()))
{
auto col_to = ColumnFixedString::create(Impl::length);
const typename ColumnFixedString::Chars & data = col_from_fix->getChars();
const auto size = col_from_fix->size();
auto & chars_to = col_to->getChars();
const auto length = col_from_fix->getN();
chars_to.resize(size * Impl::length);
for (size_t i = 0; i < size; ++i)
{
Impl::apply(
reinterpret_cast<const char *>(&data[i * length]), length, reinterpret_cast<uint8_t *>(&chars_to[i * Impl::length]));
}
return col_to;
}
else
throw Exception("Illegal column " + arguments[0].column->getName()
+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
};
DECLARE_MULTITARGET_CODE(
template <typename Impl, typename Name>
class FunctionIntHash : public IFunction
{
public:
static constexpr auto name = Name::name;
private:
using ToType = typename Impl::ReturnType;
template <typename FromType>
ColumnPtr executeType(const ColumnsWithTypeAndName & arguments) const
{
using ColVecType = ColumnVectorOrDecimal<FromType>;
if (const ColVecType * col_from = checkAndGetColumn<ColVecType>(arguments[0].column.get()))
{
auto col_to = ColumnVector<ToType>::create();
const typename ColVecType::Container & vec_from = col_from->getData();
typename ColumnVector<ToType>::Container & vec_to = col_to->getData();
size_t size = vec_from.size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
vec_to[i] = Impl::apply(vec_from[i]);
return col_to;
}
else
throw Exception("Illegal column " + arguments[0].column->getName()
+ " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
}
public:
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!arguments[0]->isValueRepresentedByNumber())
throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return std::make_shared<DataTypeNumber<typename Impl::ReturnType>>();
}
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const IDataType * from_type = arguments[0].type.get();
WhichDataType which(from_type);
if (which.isUInt8())
return executeType<UInt8>(arguments);
else if (which.isUInt16())
return executeType<UInt16>(arguments);
else if (which.isUInt32())
return executeType<UInt32>(arguments);
else if (which.isUInt64())
return executeType<UInt64>(arguments);
else if (which.isInt8())
return executeType<Int8>(arguments);
else if (which.isInt16())
return executeType<Int16>(arguments);
else if (which.isInt32())
return executeType<Int32>(arguments);
else if (which.isInt64())
return executeType<Int64>(arguments);
else if (which.isDate())
return executeType<UInt16>(arguments);
else if (which.isDate32())
return executeType<Int32>(arguments);
else if (which.isDateTime())
return executeType<UInt32>(arguments);
else if (which.isDecimal32())
return executeType<Decimal32>(arguments);
else if (which.isDecimal64())
return executeType<Decimal64>(arguments);
else
throw Exception("Illegal type " + arguments[0].type->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
};
) // DECLARE_MULTITARGET_CODE
template <typename Impl, typename Name>
class FunctionIntHash : public TargetSpecific::Default::FunctionIntHash<Impl, Name>
{
public:
explicit FunctionIntHash(ContextPtr context) : selector(context)
{
selector.registerImplementation<TargetArch::Default,
TargetSpecific::Default::FunctionIntHash<Impl, Name>>();
#if USE_MULTITARGET_CODE
selector.registerImplementation<TargetArch::AVX2,
TargetSpecific::AVX2::FunctionIntHash<Impl, Name>>();
selector.registerImplementation<TargetArch::AVX512F,
TargetSpecific::AVX512F::FunctionIntHash<Impl, Name>>();
#endif
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
return selector.selectAndExecute(arguments, result_type, input_rows_count);
}
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionIntHash>(context);
}
private:
ImplementationSelector<IFunction> selector;
};
DECLARE_MULTITARGET_CODE(
template <typename Impl>
class FunctionAnyHash : public IFunction
{
public:
static constexpr auto name = Impl::name;
private:
using ToType = typename Impl::ReturnType;
template <typename FromType, bool first>
void executeIntType(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to) const
{
using ColVecType = ColumnVectorOrDecimal<FromType>;
if (const ColVecType * col_from = checkAndGetColumn<ColVecType>(column))
{
const typename ColVecType::Container & vec_from = col_from->getData();
size_t size = vec_from.size();
for (size_t i = 0; i < size; ++i)
{
ToType h;
if constexpr (Impl::use_int_hash_for_pods)
{
if constexpr (std::is_same_v<ToType, UInt64>)
h = IntHash64Impl::apply(bit_cast<UInt64>(vec_from[i]));
else
h = IntHash32Impl::apply(bit_cast<UInt32>(vec_from[i]));
}
else
{
h = Impl::apply(reinterpret_cast<const char *>(&vec_from[i]), sizeof(vec_from[i]));
}
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
else if (auto col_from_const = checkAndGetColumnConst<ColVecType>(column))
{
auto value = col_from_const->template getValue<FromType>();
ToType hash;
if constexpr (std::is_same_v<ToType, UInt64>)
hash = IntHash64Impl::apply(bit_cast<UInt64>(value));
else
hash = IntHash32Impl::apply(bit_cast<UInt32>(value));
size_t size = vec_to.size();
if constexpr (first)
{
vec_to.assign(size, hash);
}
else
{
for (size_t i = 0; i < size; ++i)
vec_to[i] = Impl::combineHashes(vec_to[i], hash);
}
}
else
throw Exception("Illegal column " + column->getName()
+ " of argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
template <typename FromType, bool first>
void executeBigIntType(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to) const
{
using ColVecType = ColumnVectorOrDecimal<FromType>;
if (const ColVecType * col_from = checkAndGetColumn<ColVecType>(column))
{
const typename ColVecType::Container & vec_from = col_from->getData();
size_t size = vec_from.size();
for (size_t i = 0; i < size; ++i)
{
ToType h = Impl::apply(reinterpret_cast<const char *>(&vec_from[i]), sizeof(vec_from[i]));
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
else if (auto col_from_const = checkAndGetColumnConst<ColVecType>(column))
{
auto value = col_from_const->template getValue<FromType>();
ToType h = Impl::apply(reinterpret_cast<const char *>(&value), sizeof(value));
size_t size = vec_to.size();
if constexpr (first)
{
vec_to.assign(size, h);
}
else
{
for (size_t i = 0; i < size; ++i)
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
else
throw Exception("Illegal column " + column->getName()
+ " of argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
template <bool first>
void executeGeneric(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to) const
{
for (size_t i = 0, size = column->size(); i < size; ++i)
{
StringRef bytes = column->getDataAt(i);
const ToType h = Impl::apply(bytes.data, bytes.size);
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
template <bool first>
void executeString(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to) const
{
if (const ColumnString * col_from = checkAndGetColumn<ColumnString>(column))
{
const typename ColumnString::Chars & data = col_from->getChars();
const typename ColumnString::Offsets & offsets = col_from->getOffsets();
size_t size = offsets.size();
ColumnString::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
const ToType h = Impl::apply(
reinterpret_cast<const char *>(&data[current_offset]),
offsets[i] - current_offset - 1);
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
current_offset = offsets[i];
}
}
else if (const ColumnFixedString * col_from_fixed = checkAndGetColumn<ColumnFixedString>(column))
{
const typename ColumnString::Chars & data = col_from_fixed->getChars();
size_t n = col_from_fixed->getN();
size_t size = data.size() / n;
for (size_t i = 0; i < size; ++i)
{
const ToType h = Impl::apply(reinterpret_cast<const char *>(&data[i * n]), n);
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
else if (const ColumnConst * col_from_const = checkAndGetColumnConstStringOrFixedString(column))
{
String value = col_from_const->getValue<String>();
const ToType hash = Impl::apply(value.data(), value.size());
const size_t size = vec_to.size();
if constexpr (first)
{
vec_to.assign(size, hash);
}
else
{
for (size_t i = 0; i < size; ++i)
{
vec_to[i] = Impl::combineHashes(vec_to[i], hash);
}
}
}
else
throw Exception("Illegal column " + column->getName()
+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
template <bool first>
void executeArray(const IDataType * type, const IColumn * column, typename ColumnVector<ToType>::Container & vec_to) const
{
const IDataType * nested_type = typeid_cast<const DataTypeArray *>(type)->getNestedType().get();
if (const ColumnArray * col_from = checkAndGetColumn<ColumnArray>(column))
{
const IColumn * nested_column = &col_from->getData();
const ColumnArray::Offsets & offsets = col_from->getOffsets();
const size_t nested_size = nested_column->size();
typename ColumnVector<ToType>::Container vec_temp(nested_size);
bool nested_is_first = true;
executeForArgument(nested_type, nested_column, vec_temp, nested_is_first);
const size_t size = offsets.size();
ColumnArray::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
ColumnArray::Offset next_offset = offsets[i];
ToType h;
if constexpr (std::is_same_v<ToType, UInt64>)
h = IntHash64Impl::apply(next_offset - current_offset);
else
h = IntHash32Impl::apply(next_offset - current_offset);
if constexpr (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
for (size_t j = current_offset; j < next_offset; ++j)
vec_to[i] = Impl::combineHashes(vec_to[i], vec_temp[j]);
current_offset = offsets[i];
}
}
else if (const ColumnConst * col_from_const = checkAndGetColumnConst<ColumnArray>(column))
{
/// NOTE: here, of course, you can do without the materialization of the column.
ColumnPtr full_column = col_from_const->convertToFullColumn();
executeArray<first>(type, &*full_column, vec_to);
}
else
throw Exception("Illegal column " + column->getName()
+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
template <bool first>
void executeAny(const IDataType * from_type, const IColumn * icolumn, typename ColumnVector<ToType>::Container & vec_to) const
{
WhichDataType which(from_type);
if (which.isUInt8()) executeIntType<UInt8, first>(icolumn, vec_to);
else if (which.isUInt16()) executeIntType<UInt16, first>(icolumn, vec_to);
else if (which.isUInt32()) executeIntType<UInt32, first>(icolumn, vec_to);
else if (which.isUInt64()) executeIntType<UInt64, first>(icolumn, vec_to);
else if (which.isUInt128()) executeBigIntType<UInt128, first>(icolumn, vec_to);
else if (which.isUInt256()) executeBigIntType<UInt256, first>(icolumn, vec_to);
else if (which.isInt8()) executeIntType<Int8, first>(icolumn, vec_to);
else if (which.isInt16()) executeIntType<Int16, first>(icolumn, vec_to);
else if (which.isInt32()) executeIntType<Int32, first>(icolumn, vec_to);
else if (which.isInt64()) executeIntType<Int64, first>(icolumn, vec_to);
else if (which.isInt128()) executeBigIntType<Int128, first>(icolumn, vec_to);
else if (which.isInt256()) executeBigIntType<Int256, first>(icolumn, vec_to);
else if (which.isUUID()) executeBigIntType<UUID, first>(icolumn, vec_to);
else if (which.isEnum8()) executeIntType<Int8, first>(icolumn, vec_to);
else if (which.isEnum16()) executeIntType<Int16, first>(icolumn, vec_to);
else if (which.isDate()) executeIntType<UInt16, first>(icolumn, vec_to);
else if (which.isDate32()) executeIntType<Int32, first>(icolumn, vec_to);
else if (which.isDateTime()) executeIntType<UInt32, first>(icolumn, vec_to);
/// TODO: executeIntType() for Decimal32/64 leads to incompatible result
else if (which.isDecimal32()) executeBigIntType<Decimal32, first>(icolumn, vec_to);
else if (which.isDecimal64()) executeBigIntType<Decimal64, first>(icolumn, vec_to);
else if (which.isDecimal128()) executeBigIntType<Decimal128, first>(icolumn, vec_to);
else if (which.isDecimal256()) executeBigIntType<Decimal256, first>(icolumn, vec_to);
else if (which.isFloat32()) executeIntType<Float32, first>(icolumn, vec_to);
else if (which.isFloat64()) executeIntType<Float64, first>(icolumn, vec_to);
else if (which.isString()) executeString<first>(icolumn, vec_to);
else if (which.isFixedString()) executeString<first>(icolumn, vec_to);
else if (which.isArray()) executeArray<first>(from_type, icolumn, vec_to);
else executeGeneric<first>(icolumn, vec_to);
}
void executeForArgument(const IDataType * type, const IColumn * column, typename ColumnVector<ToType>::Container & vec_to, bool & is_first) const
{
/// Flattening of tuples.
if (const ColumnTuple * tuple = typeid_cast<const ColumnTuple *>(column))
{
const auto & tuple_columns = tuple->getColumns();
const DataTypes & tuple_types = typeid_cast<const DataTypeTuple &>(*type).getElements();
size_t tuple_size = tuple_columns.size();
for (size_t i = 0; i < tuple_size; ++i)
executeForArgument(tuple_types[i].get(), tuple_columns[i].get(), vec_to, is_first);
}
else if (const ColumnTuple * tuple_const = checkAndGetColumnConstData<ColumnTuple>(column))
{
const auto & tuple_columns = tuple_const->getColumns();
const DataTypes & tuple_types = typeid_cast<const DataTypeTuple &>(*type).getElements();
size_t tuple_size = tuple_columns.size();
for (size_t i = 0; i < tuple_size; ++i)
{
auto tmp = ColumnConst::create(tuple_columns[i], column->size());
executeForArgument(tuple_types[i].get(), tmp.get(), vec_to, is_first);
}
}
else if (const auto * map = checkAndGetColumn<ColumnMap>(column))
{
const auto & type_map = assert_cast<const DataTypeMap &>(*type);
executeForArgument(type_map.getNestedType().get(), map->getNestedColumnPtr().get(), vec_to, is_first);
}
else if (const auto * const_map = checkAndGetColumnConstData<ColumnMap>(column))
{
const auto & type_map = assert_cast<const DataTypeMap &>(*type);
executeForArgument(type_map.getNestedType().get(), const_map->getNestedColumnPtr().get(), vec_to, is_first);
}
else
{
if (is_first)
executeAny<true>(type, column, vec_to);
else
executeAny<false>(type, column, vec_to);
}
is_first = false;
}
public:
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
if constexpr (std::is_same_v<ToType, UInt128>) /// backward-compatible
{
return std::make_shared<DataTypeFixedString>(sizeof(UInt128));
}
else
return std::make_shared<DataTypeNumber<ToType>>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
size_t rows = input_rows_count;
auto col_to = ColumnVector<ToType>::create(rows);
typename ColumnVector<ToType>::Container & vec_to = col_to->getData();
if (arguments.empty())
{
/// Constant random number from /dev/urandom is used as a hash value of empty list of arguments.
vec_to.assign(rows, static_cast<ToType>(0xe28dbde7fe22e41c));
}
/// The function supports arbitrary number of arguments of arbitrary types.
bool is_first_argument = true;
for (const auto & col : arguments)
executeForArgument(col.type.get(), col.column.get(), vec_to, is_first_argument);
if constexpr (std::is_same_v<ToType, UInt128>) /// backward-compatible
{
auto col_to_fixed_string = ColumnFixedString::create(sizeof(UInt128));
col_to_fixed_string->getChars() = std::move(*reinterpret_cast<ColumnFixedString::Chars *>(&col_to->getData()));
return col_to_fixed_string;
}
return col_to;
}
};
) // DECLARE_MULTITARGET_CODE
template <typename Impl>
class FunctionAnyHash : public TargetSpecific::Default::FunctionAnyHash<Impl>
{
public:
explicit FunctionAnyHash(ContextPtr context) : selector(context)
{
selector.registerImplementation<TargetArch::Default,
TargetSpecific::Default::FunctionAnyHash<Impl>>();
#if USE_MULTITARGET_CODE
selector.registerImplementation<TargetArch::AVX2,
TargetSpecific::AVX2::FunctionAnyHash<Impl>>();
selector.registerImplementation<TargetArch::AVX512F,
TargetSpecific::AVX512F::FunctionAnyHash<Impl>>();
#endif
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
return selector.selectAndExecute(arguments, result_type, input_rows_count);
}
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionAnyHash>(context);
}
private:
ImplementationSelector<IFunction> selector;
};
struct URLHashImpl
{
static UInt64 apply(const char * data, const size_t size)
{
/// do not take last slash, '?' or '#' character into account
if (size > 0 && (data[size - 1] == '/' || data[size - 1] == '?' || data[size - 1] == '#'))
return CityHash_v1_0_2::CityHash64(data, size - 1);
return CityHash_v1_0_2::CityHash64(data, size);
}
};
struct URLHierarchyHashImpl
{
static size_t findLevelLength(const UInt64 level, const char * begin, const char * end)
{
const auto * pos = begin;
/// Let's parse everything that goes before the path
/// Suppose that the protocol has already been changed to lowercase.
while (pos < end && ((*pos > 'a' && *pos < 'z') || (*pos > '0' && *pos < '9')))
++pos;
/** We will calculate the hierarchy only for URLs in which there is a protocol, and after it there are two slashes.
* (http, file - fit, mailto, magnet - do not fit), and after two slashes there is still something
* For the rest, simply return the full URL as the only element of the hierarchy.
*/
if (pos == begin || pos == end || !(*pos++ == ':' && pos < end && *pos++ == '/' && pos < end && *pos++ == '/' && pos < end))
{
pos = end;
return 0 == level ? pos - begin : 0;
}
/// The domain for simplicity is everything that after the protocol and the two slashes, until the next slash or before `?` or `#`
while (pos < end && !(*pos == '/' || *pos == '?' || *pos == '#'))
++pos;
if (pos != end)
++pos;
if (0 == level)
return pos - begin;
UInt64 current_level = 0;
while (current_level != level && pos < end)
{
/// We go to the next `/` or `?` or `#`, skipping all at the beginning.
while (pos < end && (*pos == '/' || *pos == '?' || *pos == '#'))
++pos;
if (pos == end)
break;
while (pos < end && !(*pos == '/' || *pos == '?' || *pos == '#'))
++pos;
if (pos != end)
++pos;
++current_level;
}
return current_level == level ? pos - begin : 0;
}
static UInt64 apply(const UInt64 level, const char * data, const size_t size)
{
return URLHashImpl::apply(data, findLevelLength(level, data, data + size));
}
};
class FunctionURLHash : public IFunction
{
public:
static constexpr auto name = "URLHash";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionURLHash>(); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
const auto arg_count = arguments.size();
if (arg_count != 1 && arg_count != 2)
throw Exception{"Number of arguments for function " + getName() + " doesn't match: passed " +
toString(arg_count) + ", should be 1 or 2.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
const auto * first_arg = arguments.front().get();
if (!WhichDataType(first_arg).isString())
throw Exception{"Illegal type " + first_arg->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
if (arg_count == 2)
{
const auto & second_arg = arguments.back();
if (!isInteger(second_arg))
throw Exception{"Illegal type " + second_arg->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
}
return std::make_shared<DataTypeUInt64>();
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const auto arg_count = arguments.size();
if (arg_count == 1)
return executeSingleArg(arguments);
else if (arg_count == 2)
return executeTwoArgs(arguments);
else
throw Exception{"got into IFunction::execute with unexpected number of arguments", ErrorCodes::LOGICAL_ERROR};
}
private:
ColumnPtr executeSingleArg(const ColumnsWithTypeAndName & arguments) const
{
const auto * col_untyped = arguments.front().column.get();
if (const auto * col_from = checkAndGetColumn<ColumnString>(col_untyped))
{
const auto size = col_from->size();
auto col_to = ColumnUInt64::create(size);
const auto & chars = col_from->getChars();
const auto & offsets = col_from->getOffsets();
auto & out = col_to->getData();
ColumnString::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
out[i] = URLHashImpl::apply(
reinterpret_cast<const char *>(&chars[current_offset]),
offsets[i] - current_offset - 1);
current_offset = offsets[i];
}
return col_to;
}
else
throw Exception{"Illegal column " + arguments[0].column->getName() +
" of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
}
ColumnPtr executeTwoArgs(const ColumnsWithTypeAndName & arguments) const
{
const auto * level_col = arguments.back().column.get();
if (!isColumnConst(*level_col))
throw Exception{"Second argument of function " + getName() + " must be an integral constant", ErrorCodes::ILLEGAL_COLUMN};
const auto level = level_col->get64(0);
const auto * col_untyped = arguments.front().column.get();
if (const auto * col_from = checkAndGetColumn<ColumnString>(col_untyped))
{
const auto size = col_from->size();
auto col_to = ColumnUInt64::create(size);
const auto & chars = col_from->getChars();
const auto & offsets = col_from->getOffsets();
auto & out = col_to->getData();
ColumnString::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
out[i] = URLHierarchyHashImpl::apply(
level,
reinterpret_cast<const char *>(&chars[current_offset]),
offsets[i] - current_offset - 1);
current_offset = offsets[i];
}
return col_to;
}
else
throw Exception{"Illegal column " + arguments[0].column->getName() +
" of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
}
};
struct ImplWyHash64
{
static constexpr auto name = "wyHash64";
using ReturnType = UInt64;
static UInt64 apply(const char * s, const size_t len)
{
return wyhash(s, len, 0, _wyp);
}
static UInt64 combineHashes(UInt64 h1, UInt64 h2)
{
union
{
UInt64 u64[2];
char chars[16];
};
u64[0] = h1;
u64[1] = h2;
return apply(chars, 16);
}
static constexpr bool use_int_hash_for_pods = false;
};
struct NameIntHash32 { static constexpr auto name = "intHash32"; };
struct NameIntHash64 { static constexpr auto name = "intHash64"; };
using FunctionSipHash64 = FunctionAnyHash<SipHash64Impl>;
using FunctionIntHash32 = FunctionIntHash<IntHash32Impl, NameIntHash32>;
using FunctionIntHash64 = FunctionIntHash<IntHash64Impl, NameIntHash64>;
#if USE_SSL
using FunctionMD4 = FunctionStringHashFixedString<MD4Impl>;
using FunctionHalfMD5 = FunctionAnyHash<HalfMD5Impl>;
using FunctionMD5 = FunctionStringHashFixedString<MD5Impl>;
using FunctionSHA1 = FunctionStringHashFixedString<SHA1Impl>;
using FunctionSHA224 = FunctionStringHashFixedString<SHA224Impl>;
using FunctionSHA256 = FunctionStringHashFixedString<SHA256Impl>;
using FunctionSHA384 = FunctionStringHashFixedString<SHA384Impl>;
using FunctionSHA512 = FunctionStringHashFixedString<SHA512Impl>;
#endif
using FunctionSipHash128 = FunctionAnyHash<SipHash128Impl>;
using FunctionCityHash64 = FunctionAnyHash<ImplCityHash64>;
using FunctionFarmFingerprint64 = FunctionAnyHash<ImplFarmFingerprint64>;
using FunctionFarmHash64 = FunctionAnyHash<ImplFarmHash64>;
using FunctionMetroHash64 = FunctionAnyHash<ImplMetroHash64>;
using FunctionMurmurHash2_32 = FunctionAnyHash<MurmurHash2Impl32>;
using FunctionMurmurHash2_64 = FunctionAnyHash<MurmurHash2Impl64>;
using FunctionGccMurmurHash = FunctionAnyHash<GccMurmurHashImpl>;
using FunctionMurmurHash3_32 = FunctionAnyHash<MurmurHash3Impl32>;
using FunctionMurmurHash3_64 = FunctionAnyHash<MurmurHash3Impl64>;
using FunctionMurmurHash3_128 = FunctionAnyHash<MurmurHash3Impl128>;
using FunctionJavaHash = FunctionAnyHash<JavaHashImpl>;
using FunctionJavaHashUTF16LE = FunctionAnyHash<JavaHashUTF16LEImpl>;
using FunctionHiveHash = FunctionAnyHash<HiveHashImpl>;
using FunctionXxHash32 = FunctionAnyHash<ImplXxHash32>;
using FunctionXxHash64 = FunctionAnyHash<ImplXxHash64>;
using FunctionWyHash64 = FunctionAnyHash<ImplWyHash64>;
}
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