2026-03 Monthly Summary — spiceai/datafusion Key features delivered: - FileStream Performance Metrics Accuracy Enhancement: Includes the time taken for synchronous file opening operations in the total scanning time to improve the accuracy of performance measurements. Maintains timer integrity to prevent overlaps, leading to more reliable metrics. Commit: da05287c0f11f5450c05ddc5a9fdc5fb5bb1abee. Validation included reading CSV files via AWS S3. Major bugs fixed: - Timer overlap and missing time accounting in performance metrics when FileOpener::open() performs synchronous work, resolving inaccuracies in time_elapsed_scanning_total. Addresses #20571. Overall impact and accomplishments: - Achieved more reliable and actionable performance metrics for file-stream scanning, enabling data-driven optimization and capacity planning. Reduced risk of misinterpreting scan times due to timer overlaps; improved measurement fidelity across AWS S3 workflows. Technologies/skills demonstrated: - Performance instrumentation and timer lifecycle management in the data flow, including scoped timers and careful sequencing of start_next_file, open, and time_scanning_total. - Rust-based code changes in FileStreamState::Open and related components, with end-to-end validation on AWS S3 CSV reads. - Cross-functional collaboration (co-authored by Andrew Lamb) and strong focus on testability and validation.

February 2026 monthly summary for crossoverJie/starrocks: Focused on reliability improvements and bug fixes in repository management. Delivered a targeted fix for trailing slash handling in repository location paths, added test coverage, and maintained code quality through review and CI checks. The change reduces path parsing inconsistencies and prevents mis-creation of repositories.