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feat(engine): frontier-size Expand dispatcher + lazy CSR build

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Replace the env-only mode switch with an auto policy: Expand uses the
BTREE-indexed path when the source frontier is small and the hop count bounded
(OMNIGRAPH_EXPAND_INDEXED_MAX_FRONTIER=1024, OMNIGRAPH_EXPAND_INDEXED_MAX_HOPS=6),
else the in-memory CSR. OMNIGRAPH_TRAVERSAL_MODE=indexed|csr still forces a mode.

Make the CSR index lazy: thread a GraphIndexHandle (memoizing OnceCell over a
Cached/Direct/None builder) through execute_query/execute_pipeline/
execute_rrf_query/execute_anti_join instead of a pre-built Option<&GraphIndex>.
A query served entirely by the indexed path with no AntiJoin never pays the
O(|E|) CSR build — the perf win of Tier 3. AntiJoin still realizes the index
(its negation uses CSR has_neighbors).

Net effect: selective traversals (the common case) skip the whole-graph CSR
build and resolve neighbors from the persisted, incrementally-maintained
src/dst BTREE. Existing traversal/aggregation/end_to_end/search suites now run
the indexed path by default and stay green.

Docs: constants.md (new env knobs), query-language.md (Expand dual path),
indexes.md (graph index is lazy + the indexed alternative).
This commit is contained in:
Ragnor Comerford 2026-06-08 11:32:06 +02:00
parent 7337be60c8
commit c594aeb868
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4 changed files with 127 additions and 34 deletions
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docs/user/constants.md
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@ -13,6 +13,9 @@
| Maintenance concurrency | `OMNIGRAPH_MAINTENANCE_CONCURRENCY=8` | `db/omnigraph/optimize.rs` |
| Lance blob compaction support | `LANCE_SUPPORTS_BLOB_COMPACTION = false` | `db/omnigraph/optimize.rs` |
| Graph index cache size | `8` (LRU) | `runtime_cache.rs` |
| Expand indexed-path max frontier | `OMNIGRAPH_EXPAND_INDEXED_MAX_FRONTIER=1024` | `exec/query.rs` |
| Expand indexed-path max hops | `OMNIGRAPH_EXPAND_INDEXED_MAX_HOPS=6` | `exec/query.rs` |
| Expand mode override | `OMNIGRAPH_TRAVERSAL_MODE` (`indexed`\|`csr`; unset = auto) | `exec/query.rs` |
| Default body limit | `1 MB` | `omnigraph-server/lib.rs` |
| Ingest body limit | `32 MB` | `omnigraph-server/lib.rs` |
| Engine embed model | `gemini-embedding-2-preview` | `omnigraph/embedding.rs` |