Wang Shifa developed the array_flatten function for the crossoverJie/starrocks repository, enabling users to flatten one level of nested arrays within array-typed columns. This feature addressed the need for more efficient and concise analytics workflows by supporting both constant columns and nullable arrays. Wang applied skills in algorithm design, backend development, and data structures, implementing the function in C++ and ensuring reliability through comprehensive unit tests that covered typical and edge cases. The work included detailed documentation updates with usage examples, reflecting a thorough approach to both engineering and user guidance. The contribution demonstrated depth in backend data processing.