Worked on the StarRocks/starrocks repository, focusing on backend development and SQL optimization using Java. Delivered a targeted bug fix to the SQL Query Optimizer, addressing incorrect shuffle distribution during join operations by introducing a missing project node. This change improved both the correctness and performance of distributed query execution, particularly in complex join scenarios. The solution was validated through comprehensive testing and code reviews, ensuring regression safety and robustness. Collaborated closely with cross-team peers to align documentation and implementation, demonstrating a methodical approach to problem-solving and code quality. No new features were added during this period, with efforts concentrated on stability.