Chen enhanced the SQL documentation for aggregate functions in the apache/doris-website repository, focusing on improving clarity and accuracy for users. By revising descriptions, syntax, parameters, return values, and examples for functions such as GROUP_CONCAT, HISTOGRAM, and HLL_UNION_AGG, Chen addressed ambiguities that previously hindered user onboarding and troubleshooting. The work involved technical writing and documentation skills, utilizing Markdown to ensure consistency across the SQL manual. These updates streamlined the user experience and reduced support queries related to aggregate function behavior. Chen’s contributions demonstrated attention to detail and a methodical approach to technical documentation within a collaborative open-source environment.