Add storage and query optimization roadmap#79
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Design doc covering: - Block-Max WAND for O(k log n) top-k queries - Block-aligned posting storage with skip lists - FOR/PFOR compression for 50%+ space reduction - Fieldnorm quantization (Lucene SmallFloat scheme) - Phased implementation plan (v0.0.4 through v0.0.7) Also updates README to clarify "not yet recommended" status.
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- Add multi-segment query execution section (per-segment BMW, merge results) - Add WAND vs MAXSCORE comparison (Lucene switched to MAXSCORE in 2022) - Clarify block structure: skip index entries separate from posting data - Add IDF computation note (sum df across segments) - Add DELETE handling section (punt to Postgres visibility for now) - Simplify migration: require REINDEX, no backward compatibility - Document buffer manager overhead benchmark results (validated on-disk hash) - Update references with Elastic and ECIR 2020 papers
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Summary
Adds design doc (
OPTIMIZATION_ROADMAP.md) covering planned optimizations:Updates README to clarify "not yet recommended" production status
The roadmap draws from analysis of Tantivy and Lucene implementations, prioritizing asymptotic gains (BMW) over constant-factor gains (compression).