During March 2025, Tuichen Chuxin enhanced the apache/calcite repository by implementing complex filter translation for the MongoAdapter, enabling support for nested AND and OR conditions in MongoDB queries. This work involved refactoring the translation logic in MongoFilter.java to improve maintainability and correctness when handling intricate predicate structures. Tuichen also expanded test coverage in MongoAdapterTest.java to ensure the reliability of these new features and to guard against regressions. Leveraging Java and expertise in database adapters and query translation, Tuichen’s contributions laid the groundwork for more sophisticated MongoDB query support and future extensibility within the Calcite framework.