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[WIP][POC] Pfor encoding #50088

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b40975f
Fold frame bias into bit unpacking
sfc-gh-pgaur Oct 3, 2026
1db4913
Add the PFOR codec and page format
sfc-gh-pgaur Oct 3, 2026
eca116c
Integrate PFOR with Parquet integer columns
sfc-gh-pgaur Oct 3, 2026
4c2dd6f
Test and benchmark Parquet PFOR integration
sfc-gh-pgaur Oct 3, 2026
8cdfb52
Export PFOR templates from the Arrow library
sfc-gh-pgaur Oct 3, 2026
687bdc8
Document PFOR encoding selection
sfc-gh-pgaur Oct 3, 2026
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3 changes: 3 additions & 0 deletions .gitignore
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Expand Up @@ -94,3 +94,6 @@ rat.txt

# for ODBC DLL
*.rc

# Local out-of-tree benchmark build dir
cpp/build-bench/
2 changes: 2 additions & 0 deletions cpp/src/arrow/CMakeLists.txt
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Expand Up @@ -566,6 +566,8 @@ set(ARROW_UTIL_SRCS
util/math_internal.cc
util/memory.cc
util/mutex.cc
util/pfor/pfor.cc
util/pfor/pfor_wrapper.cc
util/ree_util.cc
util/secure_string.cc
util/string.cc
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2 changes: 2 additions & 0 deletions cpp/src/arrow/meson.build
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Expand Up @@ -204,6 +204,8 @@ arrow_util_srcs = [
'util/math_internal.cc',
'util/memory.cc',
'util/mutex.cc',
'util/pfor/pfor.cc',
'util/pfor/pfor_wrapper.cc',
'util/ree_util.cc',
'util/secure_string.cc',
'util/string.cc',
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4 changes: 4 additions & 0 deletions cpp/src/arrow/util/CMakeLists.txt
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Expand Up @@ -118,6 +118,10 @@ add_arrow_test(threading-utility-test
test_common.cc
thread_pool_test.cc)

add_arrow_test(pfor-test SOURCES pfor/pfor_test.cc)

add_arrow_benchmark(pfor/pfor_benchmark)

add_arrow_benchmark(bit_block_counter_benchmark)
add_arrow_benchmark(bit_util_benchmark)
add_arrow_benchmark(bitmap_reader_benchmark)
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32 changes: 32 additions & 0 deletions cpp/src/arrow/util/bpacking.cc
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Expand Up @@ -43,6 +43,23 @@ struct UnpackDynamicFunction {
}
};

template <typename Uint>
struct UnpackBiasDynamicFunction {
using FunctionType = decltype(&bpacking::unpack_bias_scalar<Uint>);

static constexpr auto targets() {
return std::array{
ARROW_DISPATCH_TARGET_NONE(&bpacking::unpack_bias_scalar<Uint>) //
ARROW_DISPATCH_TARGET_NEON(&bpacking::unpack_bias_neon<Uint>) //
ARROW_DISPATCH_TARGET_SVE128(&bpacking::unpack_bias_sve128<Uint>) //
ARROW_DISPATCH_TARGET_SVE256(&bpacking::unpack_bias_sve256<Uint>) //
ARROW_DISPATCH_TARGET_SSE4_2(&bpacking::unpack_bias_sse4_2<Uint>) //
ARROW_DISPATCH_TARGET_AVX2(&bpacking::unpack_bias_avx2<Uint>) //
ARROW_DISPATCH_TARGET_AVX512(&bpacking::unpack_bias_avx512<Uint>) //
};
}
};

} // namespace

template <typename Uint>
Expand All @@ -57,4 +74,19 @@ template void unpack<uint16_t>(const uint8_t*, uint16_t*, const UnpackOptions&);
template void unpack<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void unpack<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void unpack_bias(const uint8_t* in, Uint* out, const UnpackOptions& opts, Uint bias) {
static const DynamicDispatch<UnpackBiasDynamicFunction<Uint>> dispatch;
return dispatch(in, out, opts, bias);
}

template void unpack_bias<uint8_t>(const uint8_t*, uint8_t*, const UnpackOptions&,
uint8_t);
template void unpack_bias<uint16_t>(const uint8_t*, uint16_t*, const UnpackOptions&,
uint16_t);
template void unpack_bias<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&,
uint32_t);
template void unpack_bias<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&,
uint64_t);

} // namespace arrow::internal
602 changes: 330 additions & 272 deletions cpp/src/arrow/util/bpacking_dispatch_internal.h
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25 changes: 25 additions & 0 deletions cpp/src/arrow/util/bpacking_internal.h
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Expand Up @@ -48,4 +48,29 @@ extern template ARROW_TEMPLATE_EXPORT void unpack<uint32_t>( //
extern template ARROW_TEMPLATE_EXPORT void unpack<uint64_t>( //
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

/// \brief Unpack, adding `bias` to every value.
///
/// Equivalent to `unpack()` followed by a loop adding `bias`, but the addition
/// happens inside the unpacker before its store, so the output is traversed
/// once instead of twice. Frame-of-reference decoders are the motivating
/// caller: the separate add pass costs as much as the unpack it follows.
///
/// `bias + value` is computed in `Uint`, so it wraps rather than saturating.
/// Not defined for `bool` output, where an add has no meaning.
template <typename Uint>
ARROW_EXPORT void unpack_bias(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias<uint8_t>( //
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias<uint16_t>( //
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias<uint32_t>( //
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias<uint64_t>( //
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

} // namespace arrow::internal
15 changes: 15 additions & 0 deletions cpp/src/arrow/util/bpacking_scalar.cc
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Expand Up @@ -33,4 +33,19 @@ template void unpack_scalar<uint16_t>(const uint8_t*, uint16_t*, const UnpackOpt
template void unpack_scalar<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void unpack_scalar<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void unpack_bias_scalar(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias) {
return unpack_jump<ScalarUnpackerForWidth, /*kHasBias=*/true>(in, out, opts, bias);
}

template void unpack_bias_scalar<uint8_t>(const uint8_t*, uint8_t*, const UnpackOptions&,
uint8_t);
template void unpack_bias_scalar<uint16_t>(const uint8_t*, uint16_t*,
const UnpackOptions&, uint16_t);
template void unpack_bias_scalar<uint32_t>(const uint8_t*, uint32_t*,
const UnpackOptions&, uint32_t);
template void unpack_bias_scalar<uint64_t>(const uint8_t*, uint64_t*,
const UnpackOptions&, uint64_t);

} // namespace arrow::internal::bpacking
16 changes: 16 additions & 0 deletions cpp/src/arrow/util/bpacking_scalar_internal.h
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Expand Up @@ -42,4 +42,20 @@ extern template ARROW_TEMPLATE_EXPORT void unpack_scalar<uint32_t>(
extern template ARROW_TEMPLATE_EXPORT void unpack_scalar<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

template <typename Uint>
ARROW_EXPORT void unpack_bias_scalar(const uint8_t* in, Uint* out,
const UnpackOptions& opts, Uint bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_scalar<uint8_t>(
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_scalar<uint16_t>(
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_scalar<uint32_t>(
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_scalar<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

} // namespace arrow::internal::bpacking
18 changes: 18 additions & 0 deletions cpp/src/arrow/util/bpacking_simd_128.cc
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Expand Up @@ -17,9 +17,11 @@

#if defined(ARROW_HAVE_NEON)
# define UNPACK_PLATFORM unpack_neon
# define UNPACK_BIAS_PLATFORM unpack_bias_neon
# define KERNEL_PLATFORM KernelNeon
#elif defined(ARROW_HAVE_SSE4_2)
# define UNPACK_PLATFORM unpack_sse4_2
# define UNPACK_BIAS_PLATFORM unpack_bias_sse4_2
# define KERNEL_PLATFORM KernelSse42
#endif

Expand All @@ -45,7 +47,23 @@ template void UNPACK_PLATFORM<uint16_t>(const uint8_t*, uint16_t*, const UnpackO
template void UNPACK_PLATFORM<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void UNPACK_PLATFORM<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void UNPACK_BIAS_PLATFORM(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias) {
return unpack_jump<KERNEL_PLATFORM, /*kHasBias=*/true>(in, out, opts, bias);
}

template void UNPACK_BIAS_PLATFORM<uint8_t>(const uint8_t*, uint8_t*,
const UnpackOptions&, uint8_t);
template void UNPACK_BIAS_PLATFORM<uint16_t>(const uint8_t*, uint16_t*,
const UnpackOptions&, uint16_t);
template void UNPACK_BIAS_PLATFORM<uint32_t>(const uint8_t*, uint32_t*,
const UnpackOptions&, uint32_t);
template void UNPACK_BIAS_PLATFORM<uint64_t>(const uint8_t*, uint64_t*,
const UnpackOptions&, uint64_t);

} // namespace arrow::internal::bpacking

# undef UNPACK_PLATFORM
# undef UNPACK_BIAS_PLATFORM
#endif // UNPACK_PLATFORM
17 changes: 17 additions & 0 deletions cpp/src/arrow/util/bpacking_simd_128_alt.cc
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Expand Up @@ -17,6 +17,7 @@

#if defined(ARROW_HAVE_RUNTIME_SVE128)
# define UNPACK_PLATFORM unpack_sve128
# define UNPACK_BIAS_PLATFORM unpack_bias_sve128
# define KERNEL_PLATFORM KernelSve128
#endif

Expand Down Expand Up @@ -46,6 +47,22 @@ template void UNPACK_PLATFORM<uint16_t>(const uint8_t*, uint16_t*, const UnpackO
template void UNPACK_PLATFORM<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void UNPACK_PLATFORM<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void UNPACK_BIAS_PLATFORM(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias) {
return unpack_jump<KERNEL_PLATFORM, /*kHasBias=*/true>(in, out, opts, bias);
}

template void UNPACK_BIAS_PLATFORM<uint8_t>(const uint8_t*, uint8_t*,
const UnpackOptions&, uint8_t);
template void UNPACK_BIAS_PLATFORM<uint16_t>(const uint8_t*, uint16_t*,
const UnpackOptions&, uint16_t);
template void UNPACK_BIAS_PLATFORM<uint32_t>(const uint8_t*, uint32_t*,
const UnpackOptions&, uint32_t);
template void UNPACK_BIAS_PLATFORM<uint64_t>(const uint8_t*, uint64_t*,
const UnpackOptions&, uint64_t);

} // namespace arrow::internal::bpacking

#undef UNPACK_PLATFORM
#undef UNPACK_BIAS_PLATFORM
18 changes: 18 additions & 0 deletions cpp/src/arrow/util/bpacking_simd_256.cc
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Expand Up @@ -17,9 +17,11 @@

#if defined(ARROW_HAVE_SVE256) || defined(ARROW_HAVE_RUNTIME_SVE256)
# define UNPACK_PLATFORM unpack_sve256
# define UNPACK_BIAS_PLATFORM unpack_bias_sve256
# define KERNEL_PLATFORM KernelSve256
#elif defined(ARROW_HAVE_RUNTIME_AVX2)
# define UNPACK_PLATFORM unpack_avx2
# define UNPACK_BIAS_PLATFORM unpack_bias_avx2
# define KERNEL_PLATFORM KernelAvx2
#endif

Expand Down Expand Up @@ -48,6 +50,22 @@ template void UNPACK_PLATFORM<uint16_t>(const uint8_t*, uint16_t*, const UnpackO
template void UNPACK_PLATFORM<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void UNPACK_PLATFORM<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void UNPACK_BIAS_PLATFORM(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias) {
return unpack_jump<KERNEL_PLATFORM, /*kHasBias=*/true>(in, out, opts, bias);
}

template void UNPACK_BIAS_PLATFORM<uint8_t>(const uint8_t*, uint8_t*,
const UnpackOptions&, uint8_t);
template void UNPACK_BIAS_PLATFORM<uint16_t>(const uint8_t*, uint16_t*,
const UnpackOptions&, uint16_t);
template void UNPACK_BIAS_PLATFORM<uint32_t>(const uint8_t*, uint32_t*,
const UnpackOptions&, uint32_t);
template void UNPACK_BIAS_PLATFORM<uint64_t>(const uint8_t*, uint64_t*,
const UnpackOptions&, uint64_t);

} // namespace arrow::internal::bpacking

#undef UNPACK_PLATFORM
#undef UNPACK_BIAS_PLATFORM
15 changes: 15 additions & 0 deletions cpp/src/arrow/util/bpacking_simd_avx512.cc
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Expand Up @@ -33,4 +33,19 @@ template void unpack_avx512<uint16_t>(const uint8_t*, uint16_t*, const UnpackOpt
template void unpack_avx512<uint32_t>(const uint8_t*, uint32_t*, const UnpackOptions&);
template void unpack_avx512<uint64_t>(const uint8_t*, uint64_t*, const UnpackOptions&);

template <typename Uint>
void unpack_bias_avx512(const uint8_t* in, Uint* out, const UnpackOptions& opts,
Uint bias) {
return unpack_jump<Simd512UnpackerForWidth, /*kHasBias=*/true>(in, out, opts, bias);
}

template void unpack_bias_avx512<uint8_t>(const uint8_t*, uint8_t*, const UnpackOptions&,
uint8_t);
template void unpack_bias_avx512<uint16_t>(const uint8_t*, uint16_t*,
const UnpackOptions&, uint16_t);
template void unpack_bias_avx512<uint32_t>(const uint8_t*, uint32_t*,
const UnpackOptions&, uint32_t);
template void unpack_bias_avx512<uint64_t>(const uint8_t*, uint64_t*,
const UnpackOptions&, uint64_t);

} // namespace arrow::internal::bpacking
72 changes: 72 additions & 0 deletions cpp/src/arrow/util/bpacking_simd_internal.h
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Expand Up @@ -26,8 +26,10 @@ namespace arrow::internal::bpacking {

#if defined(ARROW_HAVE_NEON)
# define UNPACK_ARCH128 unpack_neon
# define UNPACK_BIAS_ARCH128 unpack_bias_neon
#elif defined(ARROW_HAVE_SSE4_2)
# define UNPACK_ARCH128 unpack_sse4_2
# define UNPACK_BIAS_ARCH128 unpack_bias_sse4_2
#endif

#if defined(UNPACK_ARCH128)
Expand All @@ -50,11 +52,29 @@ extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH128<uint32_t>(
extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH128<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

template <typename Uint>
ARROW_EXPORT void UNPACK_BIAS_ARCH128(const uint8_t* in, Uint* out,
const UnpackOptions& opts, Uint bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128<uint8_t>(
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128<uint16_t>(
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128<uint32_t>(
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

#endif // UNPACK_ARCH128
#undef UNPACK_ARCH128
#undef UNPACK_BIAS_ARCH128

#if defined(ARROW_HAVE_RUNTIME_SVE128)
# define UNPACK_ARCH128_ALT unpack_sve128
# define UNPACK_BIAS_ARCH128_ALT unpack_bias_sve128
#endif

#if defined(UNPACK_ARCH128_ALT)
Expand All @@ -78,13 +98,32 @@ extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH128_ALT<uint32_t>(
extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH128_ALT<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

template <typename Uint>
ARROW_EXPORT void UNPACK_BIAS_ARCH128_ALT(const uint8_t* in, Uint* out,
const UnpackOptions& opts, Uint bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128_ALT<uint8_t>(
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128_ALT<uint16_t>(
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128_ALT<uint32_t>(
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH128_ALT<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

#endif // UNPACK_ARCH128_ALT
#undef UNPACK_ARCH128_ALT
#undef UNPACK_BIAS_ARCH128_ALT

#if defined(ARROW_HAVE_SVE256) || defined(ARROW_HAVE_RUNTIME_SVE256)
# define UNPACK_ARCH256 unpack_sve256
# define UNPACK_BIAS_ARCH256 unpack_bias_sve256
#elif defined(UNPACK_ARCH256) || defined(ARROW_HAVE_RUNTIME_AVX2)
# define UNPACK_ARCH256 unpack_avx2
# define UNPACK_BIAS_ARCH256 unpack_bias_avx2
#endif

#if defined(UNPACK_ARCH256)
Expand All @@ -107,8 +146,25 @@ extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH256<uint32_t>(
extern template ARROW_TEMPLATE_EXPORT void UNPACK_ARCH256<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

template <typename Uint>
ARROW_EXPORT void UNPACK_BIAS_ARCH256(const uint8_t* in, Uint* out,
const UnpackOptions& opts, Uint bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH256<uint8_t>(
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH256<uint16_t>(
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH256<uint32_t>(
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void UNPACK_BIAS_ARCH256<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

#endif // UNPACK_ARCH256
#undef UNPACK_ARCH256
#undef UNPACK_BIAS_ARCH256

#if defined(ARROW_HAVE_AVX512) || defined(ARROW_HAVE_RUNTIME_AVX512)

Expand All @@ -130,6 +186,22 @@ extern template ARROW_TEMPLATE_EXPORT void unpack_avx512<uint32_t>(
extern template ARROW_TEMPLATE_EXPORT void unpack_avx512<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts);

template <typename Uint>
ARROW_EXPORT void unpack_bias_avx512(const uint8_t* in, Uint* out,
const UnpackOptions& opts, Uint bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_avx512<uint8_t>(
const uint8_t* in, uint8_t* out, const UnpackOptions& opts, uint8_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_avx512<uint16_t>(
const uint8_t* in, uint16_t* out, const UnpackOptions& opts, uint16_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_avx512<uint32_t>(
const uint8_t* in, uint32_t* out, const UnpackOptions& opts, uint32_t bias);

extern template ARROW_TEMPLATE_EXPORT void unpack_bias_avx512<uint64_t>(
const uint8_t* in, uint64_t* out, const UnpackOptions& opts, uint64_t bias);

#endif

} // namespace arrow::internal::bpacking
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