scala學習-Description Resource Path Location Type value toDF is not a member of org.apache.spark.rdd.R
編譯如下程式碼時，出現value toDF is not a member of org.apache.Spark.rdd.RDD[People] 錯誤
val rdd : RDD[People]= sparkSession.sparkContext.textFile(hdfsFile,2).map(line => line.split(“,”)).map(arr => People(arr(0),arr(1).trim.toInt))
rdd.toDF
import sqlContext.implicits._ 語句需要放在獲取sqlContext物件的語句之後
case class People(name : String, age : Int) 的定義需要放在方法的作用域之外（即Java的成員變數位置）
實際上只需要做到第二點即可解決錯誤（第一點做到可能就不會報錯了）
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