2026-01 Monthly Summary for facebookincubator/velox: Delivered a microsecond precision option for the Presto serializer, enabling 8-byte microsecond timestamps to improve precision and reduce data size. Commit 011099ae3b322e3cbb366baa1316f0769b2a48fe; PR #15904; differential revision D90148801; code reviews by Yuhta and sdruzkin. Impact: higher fidelity for time-series analytics, potential network/storage savings, and preserved compatibility with existing useLosslessTimestamp workflows. No major bugs fixed this month. Technologies demonstrated: C++, Velox codebase, Presto serializer integration, PR collaboration and review process.

December 2025: Delivered end-to-end Nimble timestamp support across batch writer/reader and selective reader, enabling reliable cross-system time data exchange with Velox. Introduced TimestampMicroNano schema type and implemented conversion between Nimble and Velox timestamps, including handling for negative timestamps. Fixed cross-stream synchronization between micros (nullable) and nanos (non-nullable) in the selective reader to prevent misalignment during skips, filters, and sparse reads. Expanded test coverage with explicit timestamp edge-case tests and fuzz tests, and validated with Strobelight results for both reader and writer. These changes improve data correctness, interoperability, and build stability, delivering tangible business value in time-series analytics and analytics pipelines.

May 2025 monthly summary for IBM/velox. Key deliverables center on the Filter subsystem: (1) Feature — Enhancements to support random filter generation for complex column types by removing ARRAY/ROW exclusions, expanding filtering capabilities. Also added getters for internal Filter state to support constructor usage and updated tests to improve API accessibility and coverage. Commits tied to this feature: 047a052a88fa489baeb4eb431bd39f7e51f14431; f65c5808dc238c9ebd59fe890df604b0cfbd7a92. (2) Bug fix — Resolved No Filters Generated issue (#13278), ensuring proper filter generation across scenarios. Commit tied to this fix: 047a052a88fa489baeb4eb431bd39f7e51f14431.

April 2025 monthly summary focusing on business value and technical achievements across two repositories. Key feature delivered: Nimble Writer Raw Data Size Statistics with an optional stats section and corresponding tests to validate raw size calculation and write path. Major bug fixed: Velox overflow risk in NegatedBigintValuesUsingBitmask by widening min_ and max_ to int64_t, ensuring correct filtering for large values. Overall impact: improved observability, data integrity, and reliability with added test coverage, supporting capacity planning and accurate processing at scale across Nimble and Velox.

2025-03 monthly update for facebookincubator/nimble. Delivered substantial enhancements to Velox vector size accounting and extended vector statistic tooling, resulting in lower memory churn and more accurate runtime cost modeling. Implementations focused on raw size calculations, encoding support, and robust statistic measurement across vector types, underpinned by tests and benchmarking improvements.

February 2025: Velox Submodule Synchronization for nimble to the latest upstream Velox commit. This maintenance reduces drift, ensures compatibility with upstream changes, and stabilizes the build pipeline to support downstream integrations and future feature work.