Nimesh delivered Velox ANSI mode arithmetic expressions support in the apache/incubator-gluten repository, expanding backend capabilities for ANSI-mode workloads. He implemented a configuration option that allows direct execution of arithmetic expressions in ANSI mode on the Velox backend, reducing reliance on Spark fallback. Using Java and Scala, Nimesh focused on backend development and performance optimization, ensuring that arithmetic operations behave predictably under ANSI mode. He also developed comprehensive tests to validate correctness and reliability. The work addressed execution path flexibility and improved maintainability, demonstrating a solid understanding of SQL processing and Spark integration within a complex distributed data processing environment.