Extreme TLDR:
Composable SQL proposes enhancing SQL with composable, statically-typed query fragments called “functors” to improve testing and business logic reuse. SQL struggles with testing complexity due to reliance on extensive test datasets and poor abstraction for business logic. Functors allow for modular query definitions, enabling easier testing, better performance, and enhanced reusability without duplicating logic across queries or compromising normalization. This approach aims to simplify SQL, making it more efficient and maintainable.