Worked on the delta-io/delta-kernel-rs repository, focusing on maintainability and correctness improvements for the ActionReconciliationVisitor component. Consolidated getter index and field name constants into a unified GetterColumn structure, streamlining code organization and reducing the risk of future regressions. Updated all relevant call sites to use the new structure, ensuring original column ordering was preserved in data selection routines. Emphasized code optimization and refactoring using Rust, with changes validated through targeted testing and linting tools such as cargo test and cargo clippy. The work prioritized long-term maintainability, aligning data access patterns and simplifying future enhancements without introducing new bug fixes.