无法在PySpark中查询JSON生成的数据框列

from pyspark.sql import SparkSession
from pyspark.sql.functions import col, from_json
from pyspark.sql.types import StructType, StructField, StringType

spark = SparkSession.builder.getOrCreate()

json_schema = StructType([
    StructField("column1", StringType(), True),
    StructField("column2", StringType(), True),
    ...
])

df = spark.read.json("path/to/json/file", schema=json_schema)

df.select(col("column1"), col("column2")).show()