public static <T> JPQLQuery<T> selectFrom(EntityPath<T> expr) {
        return select(expr).from(expr);
    }
Create a new detached JPQLQuery instance with the given projection

@param expr projection and source
@param <T>
@return select(expr).from(expr)
querydsl-jpa/src/main/java/com/querydsl/jpa/JPAExpressions.java