February 2026 monthly summary for prestodb/presto focused on enhancing error handling for remote function execution. Key feature delivered: Per-Session Error Handling Control for Remote Functions (TRY). This work introduces a per-session property to enable TRY() to catch errors from remote function calls, improving reliability and debugging at the session level. Core code changes include a new SystemSessionProperties constant TRY_CATCH_REMOTE_FUNCTION_ERRORS, a FeaturesConfig flag isTryCatchRemoteFunctionErrors (default false) and a getter isTryCatchRemoteFunctionErrorsEnabled() to expose the setting to sessions. A unit test was added to validate the new configuration property. The change aligns with the repo’s remote function execution improvements and supports per-user configurability without affecting global defaults. The feature is associated with commit 856de263efca39150d88c2dbf1f27f76b5c86849 and relates to PR #26976.

January 2026 monthly summary for prestodb/presto. Focused on enhancing error handling for TRY() by introducing a catchableByTry flag in ErrorCode, enabling extensible, centralized error handling and reducing future maintenance burden. Updated error codes and REST error categories, added tests, and simplified propagation logic.

Monthly summary for 2025-09 focusing on Prestodb/presto feature work. Delivered multi-catalog support for Presto Spark native execution by refactoring catalog property handling. Replaced NativeExecutionConnectorConfig with NativeExecutionCatalogProperties, enabling per-catalog properties files and improved configuration/management for native execution processes. Impact includes greater configurability, scalability, and reduced risk of misconfiguration in native execution deployments.

July 2025 monthly summary for prestodb/presto focusing on the Table Location Abstraction for JDBC feature. Delivered foundational API and refactors to enable customizable table location logic across JDBC connectors, improving extensibility and future integrations while preserving backward compatibility.

Month: 2025-05 | IBM/velox repository. Delivered extended xxhash64_internal hashing to support additional data types (INTEGER, SMALLINT, TINYINT, TIMESTAMP, REAL, DOUBLE) with per-type implementations, registration updates, and unit tests. This enhances data integrity and consistency for hash-based structures used in analytics workloads by broadening type coverage and ensuring correct hashing across the new types. No major bug fixes reported this month; primary focus was feature delivery and validation. Technologies/skills demonstrated include C++ type dispatch and registration, per-type hashing implementations, and comprehensive unit testing.

April 2025 monthly summary for IBM/velox. Focused on delivering a new Murmur3_x64_128 128-bit hash function with full registration and unit tests, enhancing Velox’s hashing capabilities for large-scale data processing. The feature was implemented with core hashing logic, tail processing, and finalization, registered in the hashing framework, and validated by unit tests. No major bugs fixed this month; all changes were targeted at feature delivery and test coverage. The work improves data partitioning reliability and performance, supporting analytics workloads that rely on consistent 128-bit hashing.

February 2025 monthly summary for IBM/velox focusing on performance improvements and expanded functionality to support faster joins and more flexible aggregations. Key features delivered include xxhash64 hashing support for Date, Varchar, and BigInt to enable Prestissimo join prefilters, and the internal hash combination operator to enable hash combination for prefilters. This work is complemented by tests ensuring correctness and maintainability. Additionally, the map_union_sum function was extended to support boolean keys in maps, with corresponding value-type updates and tests, including fuzzing updates.