如何使用Spark对元组进行分组、计数和返回？

import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

val conf = new SparkConf().setAppName("TupleGroupCount").setMaster("local")

val sc = new SparkContext(conf)

val data = sc.parallelize(Seq(("A", 1), ("B", 2), ("A", 3), ("B", 4), ("C", 5)))

val groupedData = data.groupBy(_._1)

val countData = groupedData.mapValues(_.size)

val result = countData.collect()

import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object TupleGroupCount {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setAppName("TupleGroupCount").setMaster("local")
    val sc = new SparkContext(conf)

    val data = sc.parallelize(Seq(("A", 1), ("B", 2), ("A", 3), ("B", 4), ("C", 5)))

    val groupedData = data.groupBy(_._1)
    val countData = groupedData.mapValues(_.size)
    val result = countData.collect()

    result.foreach(println)

    sc.stop()
  }
}