DAO for named query which performs select returning a subset of columns

[Enrico Giurin]

Hello,
as parancoe user/developer I would like to have a facility on a way to
fire named-query which returns only a subset of all the columns of my
entity/entities.

@NamedQuery(name = "Book.selectTitleAndAuthor",
query = "select book.title, book.author from Book book where
book.language = ?")

In my mind I have the idea of a new DAO wich contains several methods
which return a specific complex object containing all the info
connected with the records found.

Something like

ComplexObject selectTitleAndAuthor(String language);