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[Function](exec) replace SipHash in function by XXHash #32919

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Mar 28, 2024
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[Function](exec) replace SipHash in function by XXHash #32919

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10 changes: 3 additions & 7 deletions be/src/vec/aggregate_functions/aggregate_function_uniq.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,6 @@
#include "vec/common/assert_cast.h"
#include "vec/common/hash_table/hash.h"
#include "vec/common/hash_table/phmap_fwd_decl.h"
#include "vec/common/sip_hash.h"
#include "vec/common/string_ref.h"
#include "vec/common/uint128.h"
#include "vec/core/types.h"
Expand Down Expand Up @@ -64,16 +63,13 @@ template <typename T>
struct AggregateFunctionUniqExactData {
static constexpr bool is_string_key = std::is_same_v<T, String>;
using Key = std::conditional_t<is_string_key, UInt128, T>;
using Hash = std::conditional_t<is_string_key, UInt128TrivialHash, HashCRC32<Key>>;
using Hash = HashCRC32<Key>;

using Set = flat_hash_set<Key, Hash>;

static UInt128 ALWAYS_INLINE get_key(const StringRef& value) {
UInt128 key;
SipHash hash;
hash.update(value.data, value.size);
hash.get128(key.low, key.high);
return key;
auto hash_value = XXH_INLINE_XXH128(value.data, value.size, 0);
return UInt128 {hash_value.high64, hash_value.low64};
}

Set set;
Expand Down
20 changes: 9 additions & 11 deletions be/src/vec/functions/uuid_numeric.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,10 +22,7 @@
#include "common/status.h"
#include "runtime/large_int_value.h"
#include "vec/columns/column_vector.h"
#include "vec/columns/columns_number.h"
#include "vec/common/hash_table/hash.h"
#include "vec/common/sip_hash.h"
#include "vec/common/uint128.h"
#include "vec/core/block.h"
#include "vec/core/types.h"
#include "vec/data_types/data_type_number.h"
Expand Down Expand Up @@ -100,7 +97,6 @@ class UuidNumeric : public IFunction {
}

// TODO(zhiqiang): May be override open function?

Status execute_impl(FunctionContext* /*context*/, Block& block,
const ColumnNumbers& /*arguments*/, size_t result,
size_t input_rows_count) const override {
Expand Down Expand Up @@ -140,14 +136,16 @@ class UuidNumeric : public IFunction {
UInt64 randomSeed() const {
struct timespec times {};

clock_gettime(CLOCK_MONOTONIC, &times);
/// Not cryptographically secure as time, pid and stack address can be predictable.

SipHash hash;
hash.update(times.tv_nsec);
hash.update(times.tv_sec);
hash.update((uintptr_t)pthread_self());

return hash.get64();
auto ret = HashUtil::xxHash64WithSeed(reinterpret_cast<const char*>(&times.tv_nsec),
sizeof(times.tv_nsec), 0);
ret = HashUtil::xxHash64WithSeed(reinterpret_cast<const char*>(&times.tv_sec),
sizeof(times.tv_sec), ret);
ret = HashUtil::xxHash64WithSeed(reinterpret_cast<const char*>((uintptr_t)pthread_self()),
sizeof(pthread_t), ret);

return ret;
}
};

Expand Down
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