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c594aeb868
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). |
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