Worked on the vitessio/vitess repository to enhance the query planner by enabling the push of DISTINCT operations through window functions, targeting improved optimization and performance for queries combining DISTINCT with window functions. Focused on Go programming and database management, the work involved implementing logic to allow the planner to recognize and optimize these scenarios more effectively. Comprehensive tests were added to validate the new behavior across a variety of query patterns, ensuring correctness and robustness. No major bugs were addressed during this period, as efforts centered on query optimization and expanding test coverage to support the new planner capabilities.