During November 2025, this developer contributed to the apache/doris repository by implementing a new SQL factorial function, enabling direct factorial calculations within queries and handling edge cases for Hive compatibility. The work involved C++ development for function integration and SQL enhancements, expanding the system’s analytical capabilities and reducing the need for external workarounds. In the apache/doris-website repository, the developer produced comprehensive documentation for the new function, including syntax, parameters, and return values, with bilingual support in English and Chinese. Their technical writing and documentation management improved onboarding for developers and ensured clear, accessible guidance across multiple Doris documentation versions.