Monthly summary for 2025-04 focused on Velox work in IBM/velox. Implemented a new configuration flag to improve data-generation tuning and memory management, and stabilized the test suite by aligning buffer expectations. Key outcomes: - Enabled configurable TPC-H text pool size with velox_tpch_text_pool_size_mb (default 300 MB) to give operators predictable memory behavior during data generation and to align with Presto. - Stabilized test suite by reverting TpchConnectorTest.simple buffer size expectation to the previous 10 MB output, reducing test flakiness and improving reproducibility. Overall impact: - Improves benchmarking control and resource planning for data-generation workloads. - Increases ecosystem compatibility with Presto-based configurations. Technologies/skills demonstrated: - Feature flag design and integration (configurable memory pools). - TPC-H benchmarking workflow adjustments and validation. - Test stability improvements and CI alignment. - Clear commit traceability (see feature commit for details).

Month: 2025-01 | IBM/velox TPCH benchmark reliability and parity with Presto Java. Key feature delivered: TPCH Text Generator Buffer Size Alignment (buffer increased from 10 MB to 300 MB) to ensure consistent text generation and align with Presto Java. Major bug fixed: TPCH dbgen text buffer discrepancy resolved by aligning with Presto Java implementation (commit referenced: #12169). Overall impact: improved benchmark reliability, reduced test flakiness, and parity with Presto Java enabling more accurate performance comparisons. Technologies/skills demonstrated: C++/Velox development, memory management for large text data, cross-implementation validation, and Git-based change management.

In November 2024, focused on modernizing the Parquet writer integration by removing Thrift-related dependencies and simplifying the internal structure. Implemented Parquet writer cleanup, eliminated the Thrift dependency from CMake, and migrated code to the facebook::velox::parquet::thrift namespace. This work reduces external dependencies, improves maintainability, and positions the codebase for future reliability improvements.