Spring Data - Page Request - order by function

I am trying to implement pagination in Java application based on Spring 4.1.1.RELEASE and Hibernate 4.2.16.Final.

I have a following code:

PageRequest pageRequest = new PageRequest(pageNumber, pageSize, new Sort(new Order(Direction.DESC, "name"))
Page page = myRepository.findAll(specification, pageRequest);

and everything works fine. However now I would like to order by sql function value, for example: ORDER BY CHAR_LENGTH(name).

It works perfectly when I input such clause in @org.springframework.data.jpa.repository.Query, for example:

public class MyRepository {
  @Query("select e from MyEntity e order by CHAR_LENGTH(e.name)")
  public List<MyEntity> findAllOrderedByNameLength();
}

unfortunately I am not able to do it with PageRequest. When I pass: ORDER BY CHAR_LENGTH(name) to PageRequest as a property:

PageRequest pageRequest = new PageRequest(pageNumber, pageSize, new Sort(new Order(Direction.DESC, "ORDER BY CHAR_LENGTH(name)"))
Page page = myRepository.findAll(specification, pageRequest);

the following exception is being thrown:

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property CHAR found for type MyEntity!