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ClickHouse/dbms/src/Functions/FunctionsHashing.h
proller 23d70b2e04
Add Y_IGNORE (#4521)
2019-02-27 19:52:08 +03:00

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#pragma once
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <city.h>
#include <farmhash.h>
#include <metrohash.h>
#include <murmurhash2.h>
#include <murmurhash3.h>
#include <Common/SipHash.h>
#include <Common/typeid_cast.h>
#include <Common/HashTable/Hash.h>
#include <Common/config.h>
#if USE_XXHASH
#include <xxhash.h> // Y_IGNORE
#endif
#include <Poco/ByteOrder.h>
#include <DataTypes/DataTypesNumber.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 <Columns/ColumnsNumber.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnTuple.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <ext/range.h>
#include <ext/bit_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int NOT_IMPLEMENTED;
}
/** 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);
}
};
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 MD5Impl
{
static constexpr auto name = "MD5";
enum { length = 16 };
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 = 20 };
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 = 28 };
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 = 32 };
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 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)
{
UInt64 hashes[] = {h1, h2};
return apply(reinterpret_cast<const char *>(hashes), 16);
}
static constexpr bool use_int_hash_for_pods = false;
};
struct SipHash128Impl
{
static constexpr auto name = "sipHash128";
enum { length = 16 };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
sipHash128(begin, size, reinterpret_cast<char*>(out_char_data));
}
};
/** 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;
};
/// 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 singed 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;
};
/// 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 MurmurHash3Impl128
{
static constexpr auto name = "murmurHash3_128";
enum { length = 16 };
static void apply(const char * begin, const size_t size, unsigned char * out_char_data)
{
MurmurHash3_x64_128(begin, size, 0, out_char_data);
}
};
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 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 u8[sizeof(u64)];
};
metrohash64_1(reinterpret_cast<const UInt8 *>(s), len, 0, u8);
return u64;
}
static constexpr bool use_int_hash_for_pods = true;
};
#if USE_XXHASH
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-reproducable 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-reproducable 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;
};
#endif
template <typename Impl>
class FunctionStringHashFixedString : public IFunction
{
public:
static constexpr auto name = Impl::name;
static FunctionPtr create(const Context &) { 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 (!isString(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; }
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
{
if (const ColumnString * col_from = checkAndGetColumn<ColumnString>(block.getByPosition(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,
&chars_to[i * Impl::length]);
current_offset = offsets[i];
}
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
};
template <typename Impl, typename Name>
class FunctionIntHash : public IFunction
{
public:
static constexpr auto name = Name::name;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionIntHash>(); }
private:
using ToType = typename Impl::ReturnType;
template <typename FromType>
void executeType(Block & block, const ColumnNumbers & arguments, size_t result)
{
if (auto col_from = checkAndGetColumn<ColumnVector<FromType>>(block.getByPosition(arguments[0]).column.get()))
{
auto col_to = ColumnVector<ToType>::create();
const typename ColumnVector<FromType>::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]);
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception("Illegal column " + block.getByPosition(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; }
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
{
const IDataType * from_type = block.getByPosition(arguments[0]).type.get();
WhichDataType which(from_type);
if (which.isUInt8()) executeType<UInt8>(block, arguments, result);
else if (which.isUInt16()) executeType<UInt16>(block, arguments, result);
else if (which.isUInt32()) executeType<UInt32>(block, arguments, result);
else if (which.isUInt64()) executeType<UInt64>(block, arguments, result);
else if (which.isInt8()) executeType<Int8>(block, arguments, result);
else if (which.isInt16()) executeType<Int16>(block, arguments, result);
else if (which.isInt32()) executeType<Int32>(block, arguments, result);
else if (which.isInt64()) executeType<Int64>(block, arguments, result);
else if (which.isDate()) executeType<UInt16>(block, arguments, result);
else if (which.isDateTime()) executeType<UInt32>(block, arguments, result);
else
throw Exception("Illegal type " + block.getByPosition(arguments[0]).type->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
};
template <typename Impl>
class FunctionAnyHash : public IFunction
{
public:
static constexpr auto name = Impl::name;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionAnyHash>(); }
private:
using ToType = typename Impl::ReturnType;
template <typename FromType, bool first>
void executeIntType(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to)
{
if (const ColumnVector<FromType> * col_from = checkAndGetColumn<ColumnVector<FromType>>(column))
{
const typename ColumnVector<FromType>::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(ext::bit_cast<UInt64>(vec_from[i]));
else
h = IntHash32Impl::apply(ext::bit_cast<UInt32>(vec_from[i]));
}
else
{
h = Impl::apply(reinterpret_cast<const char *>(&vec_from[i]), sizeof(vec_from[i]));
}
if (first)
vec_to[i] = h;
else
vec_to[i] = Impl::combineHashes(vec_to[i], h);
}
}
else if (auto col_from_const = checkAndGetColumnConst<ColumnVector<FromType>>(column))
{
auto value = col_from_const->template getValue<FromType>();
ToType hash;
if constexpr (std::is_same_v<ToType, UInt64>)
hash = IntHash64Impl::apply(ext::bit_cast<UInt64>(value));
else
hash = IntHash32Impl::apply(ext::bit_cast<UInt32>(value));
size_t size = vec_to.size();
if (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 <bool first>
void executeString(const IColumn * column, typename ColumnVector<ToType>::Container & vec_to)
{
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 (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 (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>().data();
const ToType hash = Impl::apply(value.data(), value.size());
const size_t size = vec_to.size();
if (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 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);
executeAny<true>(nested_type, nested_column, vec_temp);
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 (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)
{
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.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.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.isDateTime()) executeIntType<UInt32, 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
throw Exception("Unexpected type " + from_type->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
void executeForArgument(const IDataType * type, const IColumn * column, typename ColumnVector<ToType>::Container & vec_to, bool & is_first)
{
/// Flattening of tuples.
if (const ColumnTuple * tuple = typeid_cast<const ColumnTuple *>(column))
{
const Columns & 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 Columns & 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 (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; }
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeNumber<ToType>>();
}
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) 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 (size_t i = 0; i < arguments.size(); ++i)
{
const ColumnWithTypeAndName & col = block.getByPosition(arguments[i]);
executeForArgument(col.type.get(), col.column.get(), vec_to, is_first_argument);
}
block.getByPosition(result).column = std::move(col_to);
}
};
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)
{
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(const Context &) { return std::make_shared<FunctionURLHash>(); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
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}; }
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
{
const auto arg_count = arguments.size();
if (arg_count == 1)
executeSingleArg(block, arguments, result);
else if (arg_count == 2)
executeTwoArgs(block, arguments, result);
else
throw Exception{"got into IFunction::execute with unexpected number of arguments", ErrorCodes::LOGICAL_ERROR};
}
private:
void executeSingleArg(Block & block, const ColumnNumbers & arguments, const size_t result) const
{
const auto col_untyped = block.getByPosition(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];
}
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception{"Illegal column " + block.getByPosition(arguments[0]).column->getName() +
" of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
}
void executeTwoArgs(Block & block, const ColumnNumbers & arguments, const size_t result) const
{
const auto level_col = block.getByPosition(arguments.back()).column.get();
if (!level_col->isColumnConst())
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 = block.getByPosition(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];
}
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception{"Illegal column " + block.getByPosition(arguments[0]).column->getName() +
" of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
}
};
struct NameIntHash32 { static constexpr auto name = "intHash32"; };
struct NameIntHash64 { static constexpr auto name = "intHash64"; };
using FunctionHalfMD5 = FunctionAnyHash<HalfMD5Impl>;
using FunctionSipHash64 = FunctionAnyHash<SipHash64Impl>;
using FunctionIntHash32 = FunctionIntHash<IntHash32Impl, NameIntHash32>;
using FunctionIntHash64 = FunctionIntHash<IntHash64Impl, NameIntHash64>;
using FunctionMD5 = FunctionStringHashFixedString<MD5Impl>;
using FunctionSHA1 = FunctionStringHashFixedString<SHA1Impl>;
using FunctionSHA224 = FunctionStringHashFixedString<SHA224Impl>;
using FunctionSHA256 = FunctionStringHashFixedString<SHA256Impl>;
using FunctionSipHash128 = FunctionStringHashFixedString<SipHash128Impl>;
using FunctionCityHash64 = FunctionAnyHash<ImplCityHash64>;
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 = FunctionStringHashFixedString<MurmurHash3Impl128>;
using FunctionJavaHash = FunctionAnyHash<JavaHashImpl>;
using FunctionHiveHash = FunctionAnyHash<HiveHashImpl>;
#if USE_XXHASH
using FunctionXxHash32 = FunctionAnyHash<ImplXxHash32>;
using FunctionXxHash64 = FunctionAnyHash<ImplXxHash64>;
#endif
}
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