如何使用Scala函数将Spark DataFrame除以其下一行的值

import org.apache.spark.sql.functions._
import org.apache.spark.sql.expressions.Window

val windowSpec = Window.orderBy("column_name")

val resultDF = df.withColumn("next_value", lag(col("column_name"), 1).over(windowSpec))
                 .withColumn("division_result", col("column_name") / col("next_value"))

resultDF.show()

import org.apache.spark.sql.functions._
import org.apache.spark.sql.expressions.Window

val windowSpec = Window.orderBy("column_name")

val resultDF = df.withColumn("next_value", lag(col("column_name"), 1).over(windowSpec))
                 .withColumn("division_result", col("column_name") / col("next_value"))

resultDF.show()