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Renamed SentencePiece's bundled protobuf namespace from google::protobuf to google::protobuf_sp to avoid symbol conflicts with MediaPipe's protobuf. Root cause: Both SentencePiece and MediaPipe exported google::protobuf::* symbols. At link time, the linker arbitrarily chose one implementation, causing memory corruption when mismatched vtables were used. Changes: - Renamed namespace in port_def.inc: google::protobuf -> google::protobuf_sp - Updated all 75 protobuf-lite source files with new namespace - Removed unused protobuf_namespace.h - Cleaned up podspec preprocessor definitions Fixes: #184
Implements Hierarchical Navigable Small World (HNSW) algorithm for fast approximate nearest neighbor search in VectorStore. Architecture: - SQLite remains source of truth (persistence) - HNSW serves as in-memory cache (fast search) - Hybrid search: HNSW candidates -> exact similarity recalculation - Threshold: HNSW used when document count >= 100 Changes: - Added local_hnsw dependency (pure Dart, cross-platform) - Created HnswVectorIndex wrapper with add/search/rebuild/clear - Added Pigeon methods: getAllDocumentsWithEmbeddings, getDocumentsByIds - Implemented native methods in Android (Kotlin), iOS (Swift), Web (JS) - Updated MobileVectorStoreRepository and WebVectorStoreRepository - Added 21 unit tests for HnswVectorIndex - Added 5 HNSW vs brute-force parity tests Performance: - Search complexity: O(log n) vs O(n) brute-force - Index rebuilt on initialize() from SQLite data - Documents synced to both SQLite and HNSW on add
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Pull request overview
Adds an in-memory HNSW index on top of the existing SQLite-backed VectorStore to speed up similarity search, plus new cross-platform APIs to bulk-load embeddings (for rebuild) and fetch documents by ID (for candidate hydration).
Changes:
- Introduce
HnswVectorIndex(Dart) and integrate it into web + mobile repositories with rebuild-on-initialize and hybrid search flow. - Add new platform APIs:
getAllDocumentsWithEmbeddingsandgetDocumentsByIdsacross Web (JS worker), Android (Kotlin), and iOS (Swift) + Pigeon plumbing. - Adjust iOS sentencepiece/protobuf-lite namespace to avoid symbol conflicts (protobuf → protobuf_sp), and add HNSW-focused tests.
Reviewed changes
Copilot reviewed 97 out of 102 changed files in this pull request and generated 8 comments.
Show a summary per file
| File | Description |
|---|---|
| web/sqlite_vector_store.js | Web proxy: add worker fetch-via-Blob and expose new worker methods for HNSW rebuild/hydration. |
| web/rag/sqlite_vector_store_worker.js | Worker: implement getAllDocumentsWithEmbeddings + getDocumentsByIds and wire message handler cases. |
| web/rag/sqlite_vector_store.js | Web proxy (rag): expose getAllDocumentsWithEmbeddings + getDocumentsByIds. |
| test/vector_store_parity_test.dart | Add parity tests comparing HNSW results vs brute-force cosine similarity. |
| test/hnsw_index_test.dart | New unit tests for HnswVectorIndex behaviors (add/search/rebuild/remove/threshold). |
| pubspec.yaml | Add local_hnsw dependency. |
| pubspec.lock | Lockfile update for local_hnsw. |
| pigeon.dart | Add Pigeon APIs + DocumentWithEmbedding model for HNSW rebuild. |
| lib/web/vector_store_web.dart | Extend JS interop with new methods + Dart-friendly parsers. |
| lib/pigeon.g.dart | Regenerated Pigeon Dart bindings for new APIs/types. |
| lib/core/infrastructure/web_vector_store_repository.dart | Integrate HNSW cache layer and hybrid search flow on web. |
| lib/core/infrastructure/mobile_vector_store_repository.dart | Integrate HNSW cache layer and hybrid search flow on mobile. |
| lib/core/infrastructure/hnsw_vector_index.dart | New HNSW wrapper around local_hnsw with over-fetch + rerank. |
| ios/flutter_gemma.podspec | Update protobuf conflict handling approach (namespace rename moved into sources). |
| ios/Classes/sentencepiece/third_party/protobuf-lite/zero_copy_stream_impl_lite.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/zero_copy_stream_impl.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/zero_copy_stream.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/wire_format_lite.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/time.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/strutil.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/structurally_valid.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/stringprintf.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/stringpiece.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/statusor.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/status.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/repeated_field.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/parse_context.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/message_lite.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/io_win32.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/int128.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/implicit_weak_message.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/wire_format_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/unknown_field_set.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/time.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/strutil.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/stringprintf.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/stringpiece.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/stl_util.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/statusor.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/status.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/port.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/once.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/mutex.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/map_util.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/macros.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/logging.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/int128.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/hash.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/common.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/casts.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/callback.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/stubs/bytestream.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/repeated_field.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/port_def.inc | Change PROTOBUF_NAMESPACE macros to google::protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/parse_context.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/metadata_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/message_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/map_type_handler.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/map_field_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/map_entry_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/map.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/io/zero_copy_stream_impl_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/io/zero_copy_stream_impl.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/io/zero_copy_stream.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/io/io_win32.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/io/coded_stream.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/implicit_weak_message.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/has_bits.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/generated_message_util.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/generated_message_table_driven_lite.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/generated_message_table_driven.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/generated_enum_util.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/generated_enum_reflection.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/extension_set_inl.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/extension_set.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/descriptor.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/arenastring.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/arena_impl.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/arena.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/google/protobuf/any.h | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/generated_message_util.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/generated_message_table_driven_lite.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/generated_enum_util.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/extension_set.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/common.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/coded_stream.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/bytestream.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/arenastring.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/third_party/protobuf-lite/arena.cc | Rename protobuf namespace to protobuf_sp. |
| ios/Classes/sentencepiece/src/init.cc | Update shutdown call to google::protobuf_sp::ShutdownProtobufLibrary(). |
| ios/Classes/sentencepiece/protobuf_namespace.h | Remove old macro-based namespace renaming header. |
| ios/Classes/VectorStore.swift | Add iOS implementations of new bulk embedding fetch + fetch-by-IDs APIs. |
| ios/Classes/PigeonInterface.g.swift | Regenerated Pigeon Swift bindings for new APIs/types. |
| ios/Classes/FlutterGemmaPlugin.swift | Implement new Pigeon calls for iOS platform service. |
| example/web/sqlite_vector_store.js | Mirror web proxy updates for the example app. |
| example/pubspec.lock | Example lockfile update (package version + local_hnsw transitive). |
| example/ios/Podfile.lock | Example iOS lockfile update for plugin version. |
| android/src/main/kotlin/dev/flutterberlin/flutter_gemma/VectorStore.kt | Add Android implementations of new bulk embedding fetch + fetch-by-IDs APIs. |
| android/src/main/kotlin/dev/flutterberlin/flutter_gemma/PigeonInterface.g.kt | Regenerated Pigeon Kotlin bindings for new APIs/types. |
| android/src/main/kotlin/dev/flutterberlin/flutter_gemma/FlutterGemmaPlugin.kt | Implement new Pigeon calls for Android platform service. |
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