[WIP][POC] Pfor encoding#579
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PFOR is an integer compression encoding (encoding number 11) for INT32 and INT64 columns. It compresses by subtracting the minimum value (FOR), selecting an optimal bit width via a histogram-based cost model, bit-packing the deltas, and storing outlier values as exceptions with their positions. Adds the full encoding specification in Encodings.md and the PFOR = 11 enum entry in parquet.thrift.
Remove stray colon from "Patched Frame of Reference: (PFOR = 11)" to be consistent with other headings like "Delta Encoding (DELTA_BINARY_PACKED = 5)".
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What are your thoughts about using FastLanes https://15721.courses.cs.cmu.edu/spring2024/papers/03-data2/p2132-afroozeh.pdf (which has frame of reference in addition to several other schemes, and is reported to have very good eprformance) |
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