June 2026 focused on reliability improvements and documentation accuracy for prestodb/presto. No new user-facing features were released this month; the highlights were targeted bug fixes and quality improvements that reduce ambiguity in error messages and ensure docs point to the correct resources. Key outcomes include clearer error messaging for invalid catalogs during schema creation and corrected installation links in federation documentation. These changes improve user experience, reduce support overhead, and reinforce documentation quality. Technologies demonstrated include Java error handling, unit testing, and documentation verification, with disciplined commit and PR practices.

May 2026 highlights focused on enabling connector federation via FlightShim, introducing a Flight server on C++ workers to load Java-based Presto connectors and stream record batches. Includes unit tests for FlightShim and groundwork for end-to-end integration with native connectors. No user-facing API changes; documentation and RFCs prepared (RFC 46).

November 2025 (prestodb/presto) monthly summary focused on strengthening temporal data handling in the Arrow plugin through expanded unit test coverage, enabling earlier regression detection and improved reliability for temporal data types.

2025-08 monthly summary for prestodb/presto: Stability improvements in metadata handling and cross-connector null-safety. Fixed a NullPointerException when a schema name is null in IcebergHiveMetadata.getViews and added robust null checks across Druid, Google Sheets, Hudi, and Iceberg connectors. These changes reduce runtime errors and improve query reliability when discovering views across multiple data sources.

July 2025 monthly summary for prestodb/presto: Delivered Cassandra Tuple Type Support in the Cassandra Connector, extending the CassandraType enum to include TUPLE, reading tuple types as VARCHAR, and throwing NotSupportedException for unsupported types. The change enhances data compatibility with Cassandra-based workflows and reduces downstream data transformation work. This accomplishment improves cross-database interoperability, enabling customers to query Cassandra tuples directly in Presto and reduces integration friction across Cassandra-based pipelines.

May 2025: Focused on security policy groundwork and protocol tooling in prestodb/presto. Delivered view-level access control groundwork by applying row filters and column masks to tables referenced by views, paving the way to enforce policies on views and named queries in future commits. Fixed protocol generation license header removal bug to ensure the correct presto_cpp header is used. These changes improve data security, license compliance, and maintainability, enabling safer data access and more robust protocol tooling.

Month: 2025-04 — Focused on improving query correctness and native connector reliability in prestodb/presto. The main feature delivered enables deterministic column ordering in queries, reducing ambiguity in multi-column projections and paving the way for more predictable optimization in the Arrow-based execution path. No major bugs fixed this month that are reported here; however, the work improves stability by tightening the ArrowColumnHandle protocol integration with the ArrowFlight connector.

March 2025 — prestodb/presto contributed to test reliability and CI efficiency by implementing dynamic port allocation for Arrow Flight tests, replacing hardcoded ports to prevent conflicts and enable concurrent test execution. This change reduces flaky tests, shortens feedback cycles, and strengthens confidence in CI results. No major bugs fixed this month. Overall impact: more stable CI, faster merge cycles, and improved test quality. Technologies/skills demonstrated: test infrastructure improvements, dynamic port management, Arrow Flight testing, and CI parallelism.

February 2025 highlights for prestodb/presto: Delivered Arrow Flight testing enhancements including renaming the testing connector to arrow-flight, added worker-count helper utility, and expanded end-to-end tests for the native Arrow Flight connector; CI now builds Native Presto server with Arrow Flight enabled, improving early defect detection. Hardened security by enabling server verification by default for Arrow Flight connections (verifyServer=true) and simplifying FlightClient creation. Implemented a performance-oriented query planning optimization for column masks by building the root node once, accompanied by updated documentation for row filters and column masks in system access control. These efforts collectively improve reliability, security, and performance, while enhancing developer productivity and CI feedback loops.

January 2025 monthly performance summary: Delivered core security, interoperability, and quality-of-life improvements across Presto (prestodb/presto) and Velox (oap-project/velox), strengthening data governance and cross-system integration while improving CI reliability. The team emphasized business value through granular access controls, broader data source connectivity, deterministic CI testing, and enriched data-type tooling.

December 2024 monthly summary for prestodb/presto: Implemented row-level data filtering and column masking to strengthen data governance and access control in the Presto engine; fixed a regression around SessionPropertyManager initialization to ensure proper startup and plan checking. These changes integrated into the query planning, analysis, and session management layers, enabling enforceable access controls at runtime and dynamic data masking based on user roles. Result: improved security posture, regulatory compliance support, and reduced risk of unauthorized data exposure in analytics queries.

Monthly performance summary for 2024-11 focusing on Velox repository (oap-project/velox). Delivered a critical bug fix to align UUID serialization with Presto Java expectations and added tests to prevent regressions. The changes improve cross-language compatibility, data integrity, and overall stability for UUID handling in the Velox codebase.

Month 2024-10 performance summary for prestodb/presto: Implemented a native plan checker for the Sidecar Plugin to validate plan fragments by converting them to Velox plans on the native sidecar. Enabled via configuration property. This work strengthens query safety, reduces runtime plan errors, and accelerates diagnosis by surfacing native-side errors early. No major bug fixes reported this month; ongoing validation infrastructure established to support future reliability improvements.

September 2024: Delivered foundational Presto to Velox Plan Conversion API, enabling conversion of Presto plan fragments to Velox plans with robust error handling and HTTP semantics. This work lays groundwork for Velox-based optimization and deeper Presto–Velox integration; improved API design and error handling readiness.