scala中的withColumn函数没有将contstant值添加到列

import org.apache.spark.sql.{DataFrame, SparkSession}
import org.apache.spark.sql.functions.lit

object Main {
  def main(args: Array[String]): Unit = {
    // 创建SparkSession
    val spark = SparkSession.builder()
      .appName("Example")
      .master("local")
      .getOrCreate()

    // 创建示例DataFrame
    val df: DataFrame = spark.createDataFrame(Seq(
      (1, "John"),
      (2, "Alice"),
      (3, "Bob")
    )).toDF("id", "name")

    // 使用withColumn函数将constant值添加到列
    val dfWithConstant = df.withColumn("age", lit(25))

    // 显示结果
    dfWithConstant.show()
  }
}