waffle_db 0.0.2+1

An advanced, local vector database for Flutter, powered by Rust and HNSW graph indexing.

0.0.2+1

• OHOS Platform Support: Introduced OpenHarmony (OHOS) SDK environment variable retrieval in Environment, updated Rustup toolchain resolution, added target configurations for OHOS in Target, updated CMake configuration to handle OHOS builds, and modified Gradle plugin to utilize ExecOperations.
• Dependencies & Bindings: Updated dependencies in pubspec.yaml and Cargo.toml to latest versions and regenerated Rust API files using flutter_rust_bridge version 2.13.0.

0.0.2

• HNSW Save Reliability: Fixed a bug where closing or flushing an empty HNSW index returned an error by skipping index dump if the graph contains 0 elements.

• Index Load Resiliency: Fixed a startup crash ("failed to fill whole buffer") by ensuring both the map and the HNSW graph file exist on disk before trying to load them.

• Asynchronous Benchmark Suite: Added a comprehensive real-world async performance benchmark suite under test/vector_db_real_world_benchmark_test.dart using benchmark_harness.

• Color Semantic Search Example: Rewrote the example app under example/lib/main.dart into an interactive, visual color semantic search demonstration that inserts up to 12 million random colors and queries the 150 closest matches in milliseconds.

• Performance Optimization: Optimized vector serialization/deserialization on read paths using fast raw pointer copies.

• Memory Footprint Reduction: Pre-allocated internal map capacities (id_map, reverse_id_map, and ID list vectors) based on database size, preventing multiple heap reallocations.

• Mutex Lock Consolidation & Deadlock Prevention: Combined separate ID mapping locks into a single IdRegistry mutex, avoiding cross-lock deadlock hazards and minimizing locking overhead.

• Zero-Copy Batch Insertion: Refactored waffle_insert_batch to slice the flat array directly for disk persistence, reducing heap-allocated vector clones by 50%.

• Correctness & Performance Fix: Linked includeMetadata in WaffleQueryBuilder to the underlying Rust API so metadata is correctly retrieved when requested, and omitted when not needed.

• Dart Namespace Caching: Cached collection namespace prefixes in WaffleCollection to avoid dynamic string creation during filtering.

0.0.1+1

• fix unsupported platforms

0.0.1

• Initial release of Waffle-DB.