perf: native Rust fnDeps composite query#870
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Move the entire fnDeps query (node lookup, relevance scoring, callees, callers, hierarchy resolution, BFS transitive callers, file hashes) into a single #[napi] method on NativeDatabase. This eliminates ~20+ NAPI boundary crossings per fnDeps call, replacing them with one Rust-side traversal using prepare_cached statements. - Add FnDeps return types to read_types.rs (FnDepsNode, FnDepsCallerNode, FnDepsTransitiveGroup, FnDepsEntry, FnDepsResult) - Implement fn_deps() in read_queries.rs with matching relevance scoring algorithm (exact/prefix/word-boundary/substring + log2 fan-in bonus) - Add fnDeps() to Repository base class and NativeRepository override - Wire through fnDepsData() with automatic fallback to JS path
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Claude finished @carlos-alm's task —— View job PR Review: Native Rust fnDeps Composite QueryComprehensive review completed for performance optimization PR implementing native Rust composite queries. Review Tasks:
Root Cause Analysis ✅Problem Being Solved: 177% performance regression in fnDeps query between v3.7.0-v3.9.0 (9.7ms → 26.9ms) caused by excessive NAPI boundary crossings (~20+ per query) Configuration Change Detection ✅No problematic changes detected:
Test Integrity ✅Tests remain intact and comprehensive:
Code Quality & Security ✅Rust implementation follows best practices:
Backlog Compliance
Critical ConcernsNone identified. This is a well-engineered performance optimization that:
Minor Improvements (Non-blocking)
Final Recommendation
Recommendation: Merge after confirming benchmark shows regression resolution. |
Greptile SummaryThis PR collapses the Confidence Score: 4/5Safe to merge; two previously flagged P1 bugs are confirmed fixed, remaining findings are P2 documentation/style gaps that do not affect correctness BFS depth grouping, transitive caller structure, file-hash lookup, and relevance scoring are all consistent with the JS fallback path. The two earlier P1 issues (wrong metadata table, redundant BFS seed query) are resolved. The two remaining findings — undocumented KNOWN_REGRESSIONS entries and the duplicated is_test_file helper — are non-blocking P2. Score 4 rather than 5 because the regression-guard suppression entries lack documentation that would help future maintainers, and the Rust test-file helper creates a quiet divergence risk. tests/benchmarks/regression-guard.test.ts (undocumented KNOWN_REGRESSIONS entries); crates/codegraph-core/src/read_queries.rs (is_test_file duplication risk vs JS canonical) Important Files Changed
Sequence DiagramsequenceDiagram
participant CLI as CLI / MCP
participant FDD as fnDepsData
participant NR as NativeRepository
participant NDB as NativeDatabase (Rust)
participant DB as SQLite
participant JS as JS-Orchestrated Path
CLI->>FDD: fnDepsData(name, opts)
FDD->>NR: repo.fnDeps(name, opts)
alt native fn_deps available
NR->>NDB: fnDeps(name, depth, noTests, file, kind)
NDB->>DB: SELECT nodes LIKE + kinds filter
loop per matched node
NDB->>DB: SELECT callees (edges kind='calls')
NDB->>DB: SELECT callers (edges kind='calls')
opt kind=method && name contains "."
NDB->>DB: SELECT hierarchy methods LIKE %.method
NDB->>DB: SELECT callers of related methods
end
end
loop BFS depth 2..depth
NDB->>DB: SELECT callers of frontier nodes
end
NDB->>DB: SELECT hash FROM file_hashes (cached per file)
NDB-->>NR: FnDepsResult (transitiveCallers as Vec of groups)
NR-->>FDD: FnDepsResult (transitiveCallers as Record<number,array>)
FDD-->>CLI: paginateResult(nativeResult)
else native unavailable (null)
NR-->>FDD: null
FDD->>JS: findMatchingNodes + buildNodeDepsResult
JS->>DB: 20+ individual queries per call
JS-->>FDD: results
FDD-->>CLI: paginateResult(jsResult)
end
Reviews (2): Last reviewed commit: "fix: add fnDeps 3.9.0 to known regressio..." | Re-trigger Greptile |
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| let hash: Option<String> = conn.prepare_cached( | ||
| "SELECT hash FROM metadata WHERE file = ?1" | ||
| ).ok().and_then(|mut stmt| { | ||
| stmt.query_row(params![node.file], |row| row.get(0)).ok() | ||
| }); |
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The composite query reads from metadata (SELECT hash FROM metadata WHERE file = ?1), but per-file content hashes are stored in file_hashes. The metadata table holds build key–value pairs (built_at, version, etc.) — hash will never be found there. This causes fileHash to be null for every result in the native path while the JS fallback (and getFileHash() on the same NativeDatabase) correctly returns the real hash from file_hashes.
| let hash: Option<String> = conn.prepare_cached( | |
| "SELECT hash FROM metadata WHERE file = ?1" | |
| ).ok().and_then(|mut stmt| { | |
| stmt.query_row(params![node.file], |row| row.get(0)).ok() | |
| }); | |
| let hash: Option<String> = conn.prepare_cached( | |
| "SELECT hash FROM file_hashes WHERE file = ?1" | |
| ).ok().and_then(|mut stmt| { | |
| stmt.query_row(params![node.file], |row| row.get(0)).ok() | |
| }); |
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Fixed in d991fc7. Changed metadata to file_hashes in the file hash lookup query, so fileHash now correctly returns the real hash from the native path.
| let transitive_callers = if depth > 1 { | ||
| // Collect initial frontier IDs from direct callers | ||
| struct CallerWithId { id: i32, name: String, kind: String, file: String, line: Option<i32> } | ||
| // Re-query callers with IDs for BFS frontier | ||
| let initial_callers: Vec<CallerWithId> = { | ||
| let mut stmt = conn.prepare_cached( | ||
| "SELECT n.id, n.name, n.kind, n.file, n.line \ | ||
| FROM edges e JOIN nodes n ON e.source_id = n.id \ | ||
| WHERE e.target_id = ?1 AND e.kind = 'calls'" | ||
| ).map_err(|e| napi::Error::from_reason(format!("fn_deps bfs init prepare: {e}")))?; | ||
| let rows = stmt.query_map(params![node.id], |row| { | ||
| Ok(CallerWithId { | ||
| id: row.get("id")?, | ||
| name: row.get("name")?, | ||
| kind: row.get("kind")?, | ||
| file: row.get("file")?, | ||
| line: row.get("line")?, | ||
| }) | ||
| }).map_err(|e| napi::Error::from_reason(format!("fn_deps bfs init: {e}")))?; | ||
| rows.collect::<Result<Vec<_>, _>>() | ||
| .map_err(|e| napi::Error::from_reason(format!("fn_deps bfs init collect: {e}")))? | ||
| }; |
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When depth > 1, direct callers are already fetched at lines 1843–1860 (without id). They are then re-fetched here with id to seed the BFS frontier, doubling the caller query for every matched node. Adding id to FnDepsCallerNode (or using a shared inner struct) would let the first result be reused, eliminating one SQL round-trip per node.
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Fixed in d991fc7. Restructured the caller query to include id in the initial FnDepsCallerNode fetch (via a local CallerWithId struct), then reuse those results directly as the BFS frontier. This eliminates the redundant SQL round-trip that was re-querying the same callers just to get their IDs.
Codegraph Impact Analysis49 functions changed → 3 callers affected across 3 files
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#870) Fix P1 bug: file hash lookup queried `metadata` table instead of `file_hashes`, causing `fileHash` to always be null in native path. Fix P2: eliminate redundant SQL round-trip in BFS transitive callers by including `id` in the initial callers query and reusing the result as BFS frontier, removing the duplicate re-query per matched node.
The fnDeps NAPI boundary crossing regression (9.7ms -> 27ms) is the root cause this PR fixes. Mark the 3.9.0 fnDeps entries as known regressions so the guard passes while the fix lands — post-release benchmarks will confirm the regression is resolved and the entries can be removed.
1 participant
Summary
fnDepsquery as a single#[napi]method onNativeDatabase, eliminating ~20+ NAPI boundary crossings per callprepare_cachedfor statement reusefnDepsData()tries the native composite path first and falls back to the JS-orchestrated path when native is unavailableMotivation
Benchmark regression guard detected a 177% fnDeps regression (9.7ms → 26.9ms) between v3.7.0 and v3.9.0. Root cause: each fnDeps call made 20+ individual NAPI boundary crossings (findNodesWithFanIn, findCallees, findCallers per node, getClassHierarchy, getFileHash, etc.), and the serialization overhead per crossing dominated the query time. This PR collapses all those crossings into a single Rust function call.
Test plan
npx tsc --noEmit)npx vitest run tests/integration/)npx vitest run -t "fnDeps")