Developed end-to-end support for the RENAME DICTIONARY DDL statement in the databendlabs/databend repository, enabling users to rename dictionaries within the query system safely. The work involved implementing API endpoints, backend logic, and abstract syntax tree (AST) support using Rust and SQL, with careful handling of both existing and non-existent dictionaries to ensure robust rename semantics. Comprehensive tests and updated documentation were provided to clarify API usage and expected behavior. This focused contribution addressed a core database internals feature, delivering a complete solution from backend implementation to user-facing documentation within a single, well-scoped development cycle.