February 2026 (2026-02) monthly summary for apache/incubator-gluten: Delivered Thai and Khmer digit date parsing support in CH, with SIMD-accelerated local digit conversion, regression tests, and comprehensive test fixtures. Achieved significant reliability and performance gains in date parsing for locales using non-Latin numerals, expanding market reach and reducing data normalization errors. Key improvements included robustness for UTF-8 handling, corrected digit mappings for Devanagari/Bengali, and optimized digit detection to avoid unnecessary scans. This work enhances data quality and processing efficiency in international pipelines.

Monthly summary for 2026-01 focusing on correctness and stability of join validation in gluten's Broadcast Nested Loop Joins (BNLJ) path. Implemented fix for empty build-side scenarios and improved outer-join handling to ensure reliable results across CH and non-CH paths. The work reduces edge-case inconsistencies in query results for analytics workloads and strengthens test reliability.

Feb 2025: Gluten/ClickHouse backend improvements focusing on correctness and performance. Key work includes a NaN semantics fix with tests and a bloom filter optimization that speeds up constant arguments in bloomFilterContains. These changes enhance query correctness for NaN values and deliver measurable performance gains on bloom filter evaluations.

Month 2025-01 summary focused on delivering robust data parsing and Spark interoperability across two primary repos. Key work emphasized refactoring for accuracy and compatibility, accompanied by thorough tests to ensure reliability and future maintainability.

December 2024: Focused on strengthening Enum handling, expanding date/time parsing, and elevating test quality in Altinity/ClickHouse. Delivered features and resolved core reliability issues, contributing to more robust SQL behavior and safer deployments across the repository.

November 2024: Focused on Spark interoperability and codebase maintainability for Altinity/ClickHouse. Delivered a new configuration knob, composed_data_type_output_format_mode, to govern output formatting for composed data types (arrays, maps, tuples) to improve Spark compatibility. Updated tests and relocated the feature to version 24.12. Addressed key cleanup and stability improvements: removed deprecated toUnixTimestampEx API and references, fixed a compile-time issue in SettingsChangesHistory.cpp, and aligned Spark_text_output_format history with the 24.12 release. These changes reduce deployment risk in Spark-enabled environments and streamline future releases.

October 2024 for apache/incubator-gluten focused on correctness and test coverage for the ClickHouse backend. Implemented a targeted RegExp replacement fix and expanded test coverage to prevent regression.