Jiangyang Yang developed a custom DML command parser for Apache Kylin, focusing on backend development and parser design using Java and JavaCC. The parser enables flexible interpretation and execution of self-defined DML commands such as SHOW JOB, LOAD PARTITION, and DELETE MODEL, supporting more expressive data manipulation within the platform. By defining tokens and grammar rules, Jiangyang ensured robust parsing of command syntax and arguments, laying groundwork for future DML extensions and automated administrative tasks. The work, integrated directly into the apache/kylin repository, demonstrates depth in DML parsing and parser development, addressing operational tooling needs for the project’s roadmap.