Worked on the StarRocks/starrocks repository to enhance the reliability of predicate evaluation within the query planning process. Focused on correcting root expression propagation in the ChunkPredicateBuilder component, ensuring that get_predicate_value consistently receives the root expression as intended. This fix addressed an invalid expression usage that previously risked incorrect query results and improved the accuracy of predicate pruning across diverse workloads. Leveraged C++ and SQL skills to implement the solution, contributing to greater code stability in a critical path of the database engine. The work demonstrated attention to subtle bugs and a methodical approach to improving database correctness and maintainability.