Worked on the apache/datafusion-sandbox repository to address correctness and reliability in backend query execution. Focused on improving the LIMIT push-down optimization by delivering a targeted fix that ensures LIMIT clauses are preserved in all execution plans, preventing incorrect removal in bounded queries. The solution involved a minimal, low-risk one-line change to the push-down logic, implemented in Rust, and was validated with a dedicated regression test to guard against future issues. This work enhanced the reliability of query results and increased confidence in plan generation across environments, demonstrating careful attention to detail and a strong understanding of backend development principles.