Developed a custom DML command parser for the apache/kylin repository, focusing on enabling flexible data manipulation through self-defined commands. Leveraging Java and JavaCC, the work involved designing and implementing grammar rules and token definitions to interpret commands such as SHOW JOB, LOAD PARTITION, LOAD MODEL, DELETE MODEL, and CANCEL JOB. This parser allows for robust parsing and execution of DML commands, laying the groundwork for automated administrative tasks and future extensibility. The project emphasized backend development and parser construction, aligning with Kylin’s roadmap for enhanced operational tooling and providing a foundation for future DML feature expansion.