Concise monthly summary for 2025-10 focusing on delivering business value through vector search improvements, stability enhancements, and maintainability improvements across Doris-related repos.

September 2025 monthly summary: Delivered significant vector-search enhancements and robustness improvements across Doris. Key features delivered include scalar quantization support for the ANN index (SQ4/SQ8), cast expressions as RHS for approximate top-N and enhanced range query capabilities; introduced ANN index lifecycle metrics and improved in-memory ANN observability. Bug fixes addressed critical range search failures and virtual column safety; ensured non-nullable array inputs for distance calculations and adjusted return types for precision. Optimization and performance improvements included an experimental session variable to push down virtual slots into OlapScan and improvements to avoid grouping scalar functions during optimization. Telemetry and tooling improvements enhanced profiling accuracy (including SQL parsing time), JSON-logged session vars, and code-format tooling cleanup. Documentation updated for vector search capabilities and profiling instrumentation.

For 2025-08, delivered foundational vector search capabilities with FAISS-based ANN index, improved profiling accuracy, and strengthened build and data correctness. Key enhancements integrate advanced vector search into the storage engine and build system, enabling scalable similarity search and statistics collection. Also fixed edge-case expression evaluation, improved data handling, and ensured OpenMP/PCH build stability. These changes deliver tangible business value: faster AI-enabled search, more reliable performance profiling, and a more robust build and data pipeline.

Month: 2024-11. This period delivered a key feature enhancement in apache/doris by enabling the Profile feature by default, improving usability and aligning with the completion of the related issue for enabling profile functionality. The change was implemented via a straightforward boolean flag adjustment in the SessionVariable class, minimizing risk while delivering immediate value.