Andy Kwok enhanced code quality for the apache/datafusion-comet repository by addressing lint issues in critical data-path APIs. He implemented an explicit Long return type for the number-of-rows API, aligning the interface with expected data scale and improving future maintainability. To further reduce static analysis noise, Andy used Scala’s @nowarn annotation to suppress non-actionable warnings on a stub, which stabilized builds and clarified intent for future contributors. His work demonstrated a strong command of Scala, Java, and lint tooling, focusing on maintainable code and preparing the codebase for upcoming refactors. The changes improved clarity and reliability in the project’s core logic.