您可以对每个组进行非空计数，并使用筛选器删除计数为0的行：

# example dataframe

df.show()
+----+----+
|col1|col2|
+----+----+
|   1|null|
|   1|null|
|   2|   1|
|   2|null|
|   3|   1|
+----+----+

from pyspark.sql import functions as F, Window

df2 = df.withColumn(
    'not_null', 
    F.count('col2').over(Window.partitionBy('col1'))
).filter('not_null != 0').drop('not_null')

df2.show()
+----+----+
|col1|col2|
+----+----+
|   3|   1|
|   2|   1|
|   2|null|
+----+----+