如何在pyspark中将多个列标题转换为新列？

from pyspark.sql import SparkSession
from pyspark.sql.functions import concat

# 创建SparkSession
spark = SparkSession.builder.getOrCreate()

# 创建示例数据集
data = [("John", "Doe", 28), ("Jane", "Smith", 32), ("Bob", "Johnson", 45)]
df = spark.createDataFrame(data, ["first_name", "last_name", "age"])

# 将"first_name"和"last_name"两列合并为一个新列"full_name"
df = df.withColumn("full_name", concat(df.first_name, df.last_name))

# 显示转换后的结果
df.show()

+----------+---------+---+-------------+
|first_name|last_name|age|    full_name|
+----------+---------+---+-------------+
|      John|      Doe| 28|    JohnDoe  |
|      Jane|    Smith| 32|  JaneSmith |
|       Bob|  Johnson| 45|BobJohnson |
+----------+---------+---+-------------+