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fix: use new Compressor::rebuild_from for FSST pushdown #2708
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Benchmarks: TPC-H on NVMETable of Results
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Benchmarks: TPC-H on S3Table of Results
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Benchmarks: Clickbench on NVMETable of Results
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Benchmarks: compressTable of Results
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CodSpeed Performance ReportMerging #2708 will improve performances by ×2.6Comparing Summary
Benchmarks breakdown
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robert3005
approved these changes
Mar 17, 2025
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The previous implementation of FSST comparison pushdown relied on rebuilding a compressor by reinserting symbols one-by-one into the CompressorBuilder, and then building it.
That doesn't work, for reasons described in the description at spiraldb/fsst#84.
We use the new
rebuild_from
API on fsst compressor to build a new compressor that is guaranteed to preserve symbol table ordering, and thus guarantee equal compression outputs.