[WIP][POC] Pfor encoding#50088

Draft

prtkgaur wants to merge 12 commits into

apache:mainfrom

prtkgaur:pfor-encoding

Commits on Jun 3, 2026

Add PFOR core algorithm and tests
sfc-gh-pgaur
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Integrate PFOR encoding into parquet encoder/decoder
sfc-gh-pgaur
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Add PFOR encoding benchmark
sfc-gh-pgaur
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Use signed integer types consistently per Arrow style guide
sfc-gh-pgaur
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Use arrow::util::span for buffer parameters in Store/Load/Decode/Serialize
sfc-gh-pgaur
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Return Result<T>/Status on decode paths instead of ARROW_DCHECK
sfc-gh-pgaur
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Add static_assert(ARROW_LITTLE_ENDIAN) and replace reinterpret_cast with SafeCopy
sfc-gh-pgaur
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Use single-call unpack() instead of manual batch loop + BitReader remainder
sfc-gh-pgaur
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Add pragma GCC unroll/ivdep to decode loops for better vectorization
sfc-gh-pgaur
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Add PforEncodedVectorView for zero-copy decode path
sfc-gh-pgaur
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Make vector_size configurable on encode path with default kPforVectorSize
sfc-gh-pgaur
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Fix pfor_test.cc: unwrap Result<> from PforVectorInfo::Load()
sfc-gh-pgaur
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