Ray Wu enhanced the IBM/velox repository by delivering two features focused on nested data processing and benchmarking. He extended the ColumnSelector to support ROW types for flatMap columns, broadening validation logic to handle both MAP and ROW structures within complex expressions. Using C++ and leveraging his expertise in type systems and software testing, Ray also refactored benchmarking utilities, introducing fuzzMap support and a random map type generator to streamline map-based fuzzing. His work included expanding test coverage for nested arrays and Row-type filtering, ensuring correctness and performance improvements for queries involving intricate columnar data structures without addressing bug fixes.