尝试将元素插入到pyspark dataframe的数组列时出现奇怪的输出

from pyspark.sql import SparkSession
from pyspark.sql.functions import col, concat, lit

spark = SparkSession.builder.getOrCreate()

data = [("Alice", [1, 2, 3]), ("Bob", [4, 5, 6])]
df = spark.createDataFrame(data, ["name", "numbers"])
df.show()

+-----+---------+
| name|  numbers|
+-----+---------+
|Alice|[1, 2, 3]|
|  Bob|[4, 5, 6]|
+-----+---------+

new_element = 7
df = df.withColumn("numbers", concat(col("numbers"), lit([new_element])))
df.show()

+-----+------------+
| name|     numbers|
+-----+------------+
|Alice|[1, 2, 3, 7]|
|  Bob|[4, 5, 6, 7]|
+-----+------------+