feat(manifest): ✨ add per-file column statistics for codec-agnostic pruning#103
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justapithecus merged 1 commit intomainfrom Feb 7, 2026
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…runing Add FileStats and ColumnStats types to FileRef for per-file column statistics. Codecs opt in via StatisticalCodec interface; Parquet is the first implementation, reporting min/max for orderable types and null count for all columns. JSONL and raw blob writes produce no stats. - New types: FileStats, ColumnStats (api.go) - New interfaces: StatisticalCodec, StatisticalStreamEncoder (api.go) - Stats field on FileRef with omitempty for backward compat - Parquet accumulates stats during Encode via table-driven comparison - Write path wired in writeDataFile and StreamWriteRecords - 14 new tests covering codec stats, write-path wiring, and JSON round-trip - Contracts updated: CONTRACT_CORE, CONTRACT_PARQUET, CONTRACT_WRITE_API - PUBLIC_API.md updated with new interfaces, types, and usage example Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Adds per-file column statistics to manifest
FileRefs, enabling external readers to prune files without opening them. The design is codec-agnostic via an optionalStatisticalCodecinterface; the Parquet codec is the first implementation.Highlights
FileStatsandColumnStatstypes onFileRef(omitempty for backward compat)StatisticalCodecandStatisticalStreamEncoderopt-in interfacesFileRef.Statsis nil)writeDataFile(batch) andStreamWriteRecords(streaming)CONTRACT_CORE.md,CONTRACT_PARQUET.md,CONTRACT_WRITE_API.mdTest plan
golangci-lintcleanstatskey; Parquet manifest JSON hasstatswith columns🤖 Generated with Claude Code