val rdd: RDD[_] = ......
rdd.repartition(1).saveAsTextFile(path)

编译错误

error: type mismatch;
[ERROR]  found   : Ordering[(some other)_$1(in value rdd)]
[ERROR]  required: Ordering[_$1(in value rdd)]

源代码

def repartition(numPartitions: Int)(implicit ord: Ordering[T] = null): RDD[T] = withScope {
    coalesce(numPartitions, shuffle = true)
  }

我用 T 为了对不同类型的rdd使用相同的函数，我应该怎么做？