2025-04 Monthly Summary for oap-project/velox: Implemented a microsecond-precision fix for Spark's 'in' function by adding a Timestamp specialization in the Set class and updating tests to cover microsecond-precision timestamp comparisons. This targeted change improves correctness for time-sensitive Spark workloads, reduces edge-case bugs in high-resolution data pipelines, and demonstrates solid C++ data-structure instrumentation and test coverage.

February 2025: Focused on improving data correctness and stability in the Velox Parquet writer. No new features shipped this month; primary accomplishment was a critical bug fix to ensure correct timezone handling in Parquet outputs across different session contexts.

January 2025 monthly performance summary for oap-project/velox focusing on robustness, correctness, and maintainability. Highlights include enhancements to the Expression Fuzzer, a critical fix for decimal distribution copy, and readability improvements. These efforts reduce crash risk in edge cases, ensure safer numeric casting for decimal workloads, and improve maintainability and onboarding velocity for the Velox repository.

December 2024 monthly summary: Key deliveries focused on performance improvements, correctness in data ingestion, and codebase quality. The work aligned with business goals of faster data processing, reliable data interpretation, and maintainable engineering practices across Velox and Gluten repositories.

Month 2024-11: Key features delivered across Velox and Gluten focused on filter pushdown, Parquet integration, and test robustness. Highlights include a pluggable ExprToSubfieldFilterParser enabling Spark-style filters, INT96 timestamp decoding in Parquet for Velox, a new Spark-compatible locate function, enhanced Spark-based subfield filter parsing in Velox, and stabilized Parquet/Int128/decimal test coverage. These efforts improve cross-engine compatibility, data ingestion reliability, and testing resilience, translating to faster, more accurate analytics.