GlareDB's function architecture is designed to simplify the implementation of SQL functions by focusing on the business logic while automatically handling vectorization and type casting, thereby enhancing performance and type safety. This system includes components like Function Sets, Function Traits, Executors, and a sophisticated type casting mechanism, which collectively enable functions to process entire data arrays efficiently and convert data types seamlessly. The architecture facilitates the implementation of scalar functions as structs with clearly defined methods for binding and execution, as exemplified by the REVERSE function, which reverses characters in a string. By abstracting complexities like null handling and array formats, GlareDB allows developers to concentrate on innovative aspects while leveraging AI agents like Devin for automating repetitive tasks, such as scaffolding and testing functions. This approach has resulted in a robust collection of over 70 built-in scalar functions, ranging from mathematical operations to string manipulations, while maintaining transparency about AI contributions in the open-source project.