Month: 2025-08 Overview: Focused on code quality and maintainability in the Apache Flink repository (apache/flink), delivering a targeted cleanup in the CodeGenUtils for INTERVAL_DAY_TIME hash code generation. This change eliminates dead code, clarifies behavior in the table-planner path, and reduces maintenance burden. No new user-facing features this month; the primary value lies in stability, clarity, and long-term maintainability. Related work supports smoother future feature development and onboarding for new contributors. Tech notes: Commit 4aac6902dd012fa70fbc50dc5ae79921b991c21a, [FLINK-38246] Remove unreachable code in CodeGenUtils.

July 2025: Apache Spark (apache/spark) focused on internal code quality improvements with no user-facing changes. The main delivery was removing deprecated commons-lang3 StringUtils methods to eliminate reliance on outdated APIs, improving maintainability and future-proofing. This work aligns with SPARK-52800 and targeted SQL and Kubernetes (K8S) areas. The change was implemented via a cleanup/refactor commit, setting a cleaner foundation for future dependency upgrades and stability across the project.

January 2025 monthly summary for xupefei/spark. Focused on stabilizing the spark-protobuf build on macOS 11 when using a user-defined protoc, delivering a targeted fix that removes a recurring compilation failure and improves CI reliability. This work reduces developer time spent on build issues and accelerates onboarding for macOS-based contributors.