PySpark :如何并列2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"), ("Jane", "Smith"), ("Bob", "Johnson")]
df = spark.createDataFrame(data, ["first_name", "last_name"])

# 并列两列
df = df.withColumn("full_name", concat(df.first_name, df.last_name))

# 显示结果
df.show()

+----------+---------+-------------+
|first_name|last_name|    full_name|
+----------+---------+-------------+
|      John|      Doe|     JohnDoe|
|      Jane|    Smith|   JaneSmith|
|       Bob|  Johnson| BobJohnson|
+----------+---------+-------------+