如何使用Scala在Spark中创建仅包含列名和数据类型的新空列

import org.apache.spark.sql.{SparkSession, DataFrame}
import org.apache.spark.sql.types.{StructType, StructField, StringType}

val spark = SparkSession.builder()
  .appName("Create Empty Column")
  .getOrCreate()

val emptySchema = StructType(Seq(
  StructField("new_column", StringType, nullable = true)
))

val emptyDF: DataFrame = spark.createDataFrame(spark.sparkContext.emptyRDD[Row], emptySchema)

emptyDF.show()