February 2026 monthly work summary for apache/paimon. This period focused on delivering core indexing features, performance improvements, and maintainability enhancements. Highlights include multi-partition support and validation in BTreeGlobalIndexBuilder, a bug fix for end row index calculation, new range-query primitives (Between and NotBetween) to accelerate range predicates, predicate handling optimizations to leverage Between LeafPredicate, external blob descriptor support for reading from external storage, and code cleanup in the B-tree index module. These changes collectively improve query performance, index reliability, and operational efficiency for large datasets.

January 2026 monthly summary for apache/paimon: Delivered key features to improve query performance, data evolution handling, and data management workflows. Implemented B-Tree indexing support and B-tree indexed scanning in Paimon core, with tests and related Spark integration work. Enhanced blob data handling to read blobs as raw bytes when blob-as-descriptor is false, enabling flexible blob formats. Extended the Files System Table with first_row_id and write_cols to support data evolution tracking. Introduced a mechanism to handle updates on global-indexed columns with configurable error reporting or partition-index drop behavior. Added a simplified MERGE INTO procedure for data-evolution tables in Flink to enable partial updates/inserts without rewriting existing files, plus documentation. Tests and refactoring accompany these changes, aligning with ongoing performance and reliability goals.

Monthly performance and delivery summary for 2025-12 across two repositories: apache/paimon and lancedb/lance. Delivered storage format improvements, indexing enhancements, and distributed indexing that together reduce latency, lower IO, and improve data integrity for large-scale analytics.