Concise monthly summary for 2026-05 focused on delivering serialization capability for explain plans and strengthening distributed execution planning in apache/datafusion.

January 2026 focused on stability and correctness across data processing and ML export pipelines. No new user-facing features shipped this month. Two critical bug fixes delivered and validated with expanded tests, improving reliability for production workloads and laying groundwork for safer feature work in the future.

May 2025 monthly summary for renovate-bot/apache-_-polaris focused on improving cleanup reliability and metadata hygiene for partitioned tables. Delivered the Table Cleanup Enhancement: Remove Partition-Level Stats Files, extending the purge workflow to also remove partition-level statistics files when DROP TABLE PURGE. This work included updating test utilities and cleanup handlers to correctly identify and delete these files, ensuring complete cleanup of stale table metadata. Commit reference: e276791068130e5812ffb0ca539dc41cf0233fca. Impact includes reduced risk of orphaned metadata, lower storage waste, and faster purge operations in partitioned workloads.

March 2025 performance: Focused on improving cleanup efficiency and CI reliability in renovate-bot/apache-_-polaris. Delivered a scalable BatchFileCleanupTaskHandler to process multiple file deletions in a single task, refactored cleanup logic with enum renaming for clarity, and fixed CI build failures by aligning nullability annotations with Jakarta EE specifications.