During January 2025, Wang Shifa developed the array_flatten function for the crossoverJie/starrocks repository, enhancing the platform’s ability to process nested array data. Leveraging C++, Java, and SQL, Wang designed the function to flatten one level of nested arrays, with careful handling for constant columns and nullable arrays. The implementation included comprehensive unit tests that addressed both typical and edge cases, ensuring robust performance and reliability. Wang also updated the public documentation with clear usage examples and detailed impact notes. This work improved the efficiency and clarity of analytics workflows involving array-typed columns, demonstrating depth in backend development and algorithm design.