JavaRDD<Person> prdd = sc.textFile("c:\\fls\\people.txt").map(
          new Function<String, Person>() {
                public Person call(String line) throws Exception {
                  String[] parts = line.split(",");
                  Person person = new Person();
                  person.setName(parts[0]);
                  person.setAge(Integer.parseInt(parts[1].trim()));
                 person.setSal(Integer.parseInt(parts[2].trim()));
                  return person;
                }
              });

       RDD<Person>personRDD =  prdd.toRDD(prdd);
       Dataset<Person> dss= sqlContext.createDataset(personRDD ,               Encoders.bean(Person.class));
   GroupedDataset<Row, Person> dq=dss.groupBy(new Column("name"));

我必须根据数据集上的姓名计算年龄和薪资组的总和。请帮助如何查询数据集？我尝试使用groupeddataset，但不知道如何继续。谢谢