If you want to see what a GraphQL with an algebra could look like, I built one! The query language is parsed with a vanilla GraphQL parser, but has directives like `@filter, @recurse, @optional` etc.

10min talk video: https://www.hytradboi.com/2022/how-to-query-almost-everythin...

GitHub: https://github.com/obi1kenobi/trustfall