Rust SQL drivers (when they exists) are mostly not production ready, they just have not the human resources.
For example the leading driver (diesel) do not support elementary SQL such as GROUP BY
I thought Diesel was just an ORM, but investigating your comment I discovered that they've implemented their own drivers in-tree. That surprises me, and also seems like a mistake. Steven Fackler's PostgreSQL driver, for instance, is widely considered to be quite solid.
