在Scala/Spark中获取键/值对的键

import org.apache.spark.{SparkConf, SparkContext}

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

    // 创建一个键值对RDD
    val pairs = sc.parallelize(Seq(("key1", 1), ("key2", 2), ("key3", 3)))

    // 获取键的RDD
    val keys = pairs.keys

    // 打印键
    keys.foreach(println)

    sc.stop()
  }
}