[WIP][POC] Pfor encoding#50088

Draft

prtkgaur wants to merge 31 commits into

apache:mainfrom

prtkgaur:pfor-encoding

Commits on Jul 15, 2026

Add PFOR core algorithm and tests
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Integrate PFOR encoding into parquet encoder/decoder
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Add PFOR encoding benchmark
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Use signed integer types consistently per Arrow style guide
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Use arrow::util::span for buffer parameters in Store/Load/Decode/Serialize
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Return Result<T>/Status on decode paths instead of ARROW_DCHECK
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Add static_assert(ARROW_LITTLE_ENDIAN) and replace reinterpret_cast with SafeCopy
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Use single-call unpack() instead of manual batch loop + BitReader remainder
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Add pragma GCC unroll/ivdep to decode loops for better vectorization
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Add PforEncodedVectorView for zero-copy decode path
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Make vector_size configurable on encode path with default kPforVectorSize
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Fix pfor_test.cc: unwrap Result<> from PforVectorInfo::Load()
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Convert PforWrapper::LoadHeader to return Result<PforHeader>
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Use SafeLoadAs/SafeStore for header and offset array in PforWrapper
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Validate header fields in PforWrapper::LoadHeader
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Use int64_t and global ::arrow:: prefix at PFOR encoder/decoder call sites
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Use uint8_t* consistently in PforWrapper API instead of char*
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Convert PforVectorInfo to class with SafeLoadAs/SafeStore and bit_width validation
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Convert PforEncodedVector and PforEncodedVectorView to classes
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Tighten PforVectorInfo encapsulation: validate num_exceptions in Load, use ctor in EncodeVector
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make
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Use bit_util::IsPowerOf2/CeilDiv and add incremental encode/decode TODOs (PFOR)
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Drop Snowflake attribution from PFOR header comments
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Fix IsPowerOf2(int32_t) ambiguity in pfor_wrapper.cc
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Add FastLanes auto-vectorized bit-packing library
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Add FastLanes-FOR to parquet-pfor-comparison-benchmark
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FastLanes-FOR: add DecodeFlat (flat output) and benchmark it
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FastLanes: add toTransposed32; correct fromTransposed32 docstring
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PFOR: add PackingMode (BitPack | FastLanes) per-vector flag
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PFOR: add OutputOrder { Flat, Transposed } decode option
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Local: keep -O3 from CMake Release defaults (drop -O2 downgrade)
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