but since pgarray is typed, you have to describe what the array contains.  the current type system seems inadequate for that.  and since using custom raw type string works right now, I'd like to get the transformation work first then go into the issue with type systems.

that said, in query-generator level we don't seem to have access to the column metadata defined by the user either.  that probably needs to be fixed too so the QG can make use of the type information when available.