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omnigraph/docs/indexes.md
Ragnor Comerford a335d98854
Refactor AGENTS.md from encyclopedia to map; move spec into docs/ 
Splits the 990-line AGENTS.md into a 184-line map (architecture,
where-to-find index, always-on invariants, capability matrix,
maintenance contract) plus 18 new docs/*.md files holding the deep
content per topic (storage, schema and query languages, indexes,
embeddings, branches/commits, runs, merge, changes, execution, policy,
server, CLI reference, audit, errors, CI, constants, v0.3.1 notes).

Adds scripts/check-agents-md.sh and a check_agents_md CI job that
verifies every docs/ link in AGENTS.md resolves and every doc in the
canonical set is linked. CLAUDE.md remains a symlink to AGENTS.md.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-28 23:31:08 +02:00

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Indexes

L1 — Lance index types OmniGraph exposes

Index Use Notes
BTREE scalar range / equality on any scalar created on @key, @index(...), and on key columns by ensure_indices()
Inverted (FTS) search, fuzzy, match_text, bm25 created on text columns referenced by FTS queries
Vector nearest() k-NN Lance picks IVF_PQ vs HNSW family by configuration; OmniGraph stores as FixedSizeList(Float32, dim)

L2 — OmniGraph orchestration

  • ensure_indices() / ensure_indices_on(branch) — idempotent build of BTREE + inverted indexes for the current head; safe to re-run.
  • Indexes are built on the branch head (not on a snapshot), so reads always see the current index state.
  • Lazy branch forking for indexes: a branch that hasn't mutated a sub-table doesn't need its own index — the main lineage's index is reused until the first write triggers a copy-on-write fork.
  • Vector index parameters (metric, nlist, nprobe, etc.) are not exposed in the schema; they default at the Lance layer and are picked up automatically when an index is asked for on a Vector column.

L2 — Graph topology index (graph_index/mod.rs)

This is OmniGraph-specific (not Lance):

  • TypeIndex: dense u32 ↔ String id mapping per node type.
  • CsrIndex: Compressed Sparse Row representation of edges per edge type — offsets[i]..offsets[i+1] slices into targets.
  • GraphIndex { type_indices, csr (out), csc (in) } — built on demand from a snapshot's edge tables.
  • Cached in RuntimeCache::graph_indices (LRU, max 8 entries, keyed by snapshot id + edge table versions).
  • Built only when an Expand or AntiJoin IR op is present in the lowered query, so pure scans skip it.