类型错误：“DataFrame”对象不可调用 - 触发数据框

我在执行提到的“加入”语句时遇到以下错误。我正在使用 pyspark 设置。连接语句或代码中所需的任何更改。

类型错误：“DataFrame”对象不可调用

df11 = spark.read.option("header","true").option("delimiter", ",").csv("s3://mybucket/file1.csv")
df22 = spark.read.option("header","true").option("delimiter", ",").csv("s3://mybucket/file2.csv")
df11.createOrReplaceTempView("table1")
df22.createOrReplaceTempView("table2")
df1 = spark.sql( "select * from table1" )
df2 = spark.sql( "select * from table2" )

df_d = df1.join(df2, df1.NO == df2.NO, 'left').filter(F.isnull(df2.NO)).select(df1.NO,df1.NAME,df1.LAT,df1.LONG, F.lit('DELETE').alias('FLAG'))

谢谢