让我们考虑以下背景：

val spark : SparkSession = _ // or val sqlContext: SQLContext = new SQLContext(sc) for 1.x
val list: DataFrame = ???

在和 c>点亮，您需要导入正确的函数：

To use when and lit, you'll need to import the proper functions :

import org.apache.spark.sql.functions.{col, lit, when}

现在你可以按照以下方式使用它们：

Now you can use them as followed :

list.select(when(col("column_name").isNotNull, lit(1)))

现在您也可以在代码中点亮：

Now you can use lit also in your code :

val score = list.withColumn("scr", lit(0))