[captaintobs]

It's easy to add errors for dialects by calling #unsupported when a function is used.

In terms of versioning of engines, I haven't implemented that yet, but presumably it could be done by adding a dialect subclass and having versioning route to it, so we could do something like parse(sql, dialect="spark", version=...) which could then route to a 2.3 version of spark.

Happy to chat more about this and we can see about adding it (or feel free to make a pr). You can DM me on twitter or some other avenue as well if you want to dive in deep.