9.15

本周学习了spark

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首先，使用样例类：

case class User(id:Int,name: String,gender:String, age: Int)

之后使用Seq创建Dataframe

val alice: User = User(3, "Alice", "F", 26)
val tom: User = User(4, "Tom", "M", 23)
val df: DataFrame = spark.createDataFrame(Seq(alice, tom))