Motivation

WithQuery is currently a separate entity from SelectStatement which is unfortunate, because it restricts where you can use it, i.e. I'd like to use a WithQuery as a FROM with from_subquery in another query but I don't believe I can, because only SelectStatements are accepted.

Proposed Solutions

Move with_clause into SelectStatement/UpdateStatement/DeleteStatement/InsertStatement instead of having a separate code path for it.

Additional Information