spark：几种给Dataset增长列的方式

咱们有一个DataFrame对象：web val df = spark.createDataset(Seq(("a", 23, 1.0), ("b", 10, 2.0))).toDF("s", "i", "d") df.show df.printSchema +---+---+---+ | s| i| d| +---+---+---+ | a| 23|1.0| | b| 10|2.0|

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