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Merge pull request #57073 from ClickHouse/implement-bit-hamming-distance-for-big-integers

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Implement `bitHammingDistance` for big integers
This commit is contained in:
Alexey Milovidov 2023-11-22 11:56:33 +01:00 committed by GitHub
commit d1015aae8e
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4 changed files with 55 additions and 9 deletions
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13
src/Functions/bitCount.cpp
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@ -1,6 +1,7 @@
#include <base/bit_cast.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionUnaryArithmetic.h>
#include <bit>
namespace DB
@ -21,19 +22,19 @@ struct BitCountImpl
{
ResultType res = 0;
for (auto item : a.items)
res += __builtin_popcountll(item);
res += std::popcount(item);
return res;
}
if constexpr (std::is_same_v<A, UInt64> || std::is_same_v<A, Int64>)
return __builtin_popcountll(a);
return std::popcount(static_cast<UInt64>(a));
if constexpr (std::is_same_v<A, UInt32> || std::is_same_v<A, Int32> || std::is_unsigned_v<A>)
return __builtin_popcount(a);
return std::popcount(static_cast<UInt32>(a));
if constexpr (std::is_same_v<A, Int16>)
return __builtin_popcount(static_cast<UInt16>(a));
return std::popcount(static_cast<UInt16>(a));
if constexpr (std::is_same_v<A, Int8>)
return __builtin_popcount(static_cast<UInt8>(a));
return std::popcount(static_cast<uint8_t>(a));
else
return __builtin_popcountll(bit_cast<uint64_t>(a));
return std::popcount(bit_cast<uint64_t>(a));
}
#if USE_EMBEDDED_COMPILER

30
src/Functions/bitHammingDistance.cpp
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@ -2,20 +2,44 @@
#include <Functions/FunctionFactory.h>
#include <bit>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
template <typename A, typename B>
struct BitHammingDistanceImpl
{
using ResultType = UInt8;
using ResultType = std::conditional_t<(sizeof(A) * 8 >= 256), UInt16, UInt8>;
static constexpr bool allow_fixed_string = true;
static constexpr bool allow_string_integer = false;
template <typename Result = ResultType>
static inline NO_SANITIZE_UNDEFINED Result apply(A a, B b)
{
UInt64 res = static_cast<UInt64>(a) ^ static_cast<UInt64>(b);
return std::popcount(res);
/// Note: it's unspecified if signed integers should be promoted with sign-extension or with zero-fill.
/// This behavior can change in the future.
if constexpr (sizeof(A) <= sizeof(UInt64) && sizeof(B) <= sizeof(UInt64))
{
UInt64 res = static_cast<UInt64>(a) ^ static_cast<UInt64>(b);
return std::popcount(res);
}
else if constexpr (is_big_int_v<A> && is_big_int_v<B>)
{
auto xored = a ^ b;
ResultType res = 0;
for (auto item : xored.items)
res += std::popcount(item);
return res;
}
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unsupported data type combination in function 'bitHammingDistance'");
}
#if USE_EMBEDDED_COMPILER

9
tests/queries/0_stateless/02921_bit_hamming_distance_big_int.reference Normal file
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@ -0,0 +1,9 @@
314776434768051644139306697240981192872 0 74 74
14776434768051644139306697240981192872314776434768051644139306697240981192872 0 141 141
314776434768051644139306697240981192872 14776434768051644139306697240981192872314776434768051644139306697240981192872 115 115
-25505932152886819324067910190787018584 0 74 74
14776434768051644139306697240981192872314776434768051644139306697240981192872 0 141 141
-25505932152886819324067910190787018584 14776434768051644139306697240981192872314776434768051644139306697240981192872 99 99
314776434768051644139306697240981192872 0 74 74
14776434768051644139306697240981192872314776434768051644139306697240981192872 0 141 141
314776434768051644139306697240981192872 14776434768051644139306697240981192872314776434768051644139306697240981192872 115 115

12
tests/queries/0_stateless/02921_bit_hamming_distance_big_int.sql Normal file
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@ -0,0 +1,12 @@
SELECT 314776434768051644139306697240981192872::UInt128 AS x, 0::UInt128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 14776434768051644139306697240981192872314776434768051644139306697240981192872::UInt256 AS x, 0::UInt128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 314776434768051644139306697240981192872::UInt128 AS x, 14776434768051644139306697240981192872314776434768051644139306697240981192872::UInt256 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 314776434768051644139306697240981192872::Int128 AS x, 0::UInt128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 14776434768051644139306697240981192872314776434768051644139306697240981192872::Int256 AS x, 0::UInt128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 314776434768051644139306697240981192872::Int128 AS x, 14776434768051644139306697240981192872314776434768051644139306697240981192872::UInt256 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 314776434768051644139306697240981192872::UInt128 AS x, 0::Int128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 14776434768051644139306697240981192872314776434768051644139306697240981192872::UInt256 AS x, 0::Int128 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;
SELECT 314776434768051644139306697240981192872::UInt128 AS x, 14776434768051644139306697240981192872314776434768051644139306697240981192872::Int256 AS y, bitCount(bitXor(x, y)) AS a, bitHammingDistance(x, y) AS b;