将值从一行放到另一行scala dataaframe

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

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

    // 定义DataFrame的结构
    val schema = StructType(Seq(
      StructField("col1", StringType, nullable = false),
      StructField("col2", IntegerType, nullable = false)
    ))

    // 创建一个空的DataFrame
    val emptyDF = spark.createDataFrame(Seq.empty[Row], schema)

    // 创建一个新的行
    val newRow = Row("value1", 123)

    // 将新行添加到DataFrame中
    val newDF = emptyDF.union(Seq(newRow).toDF(schema))

    // 打印DataFrame内容
    newDF.show()
  }
}