HyukjinKwon commented on a change in pull request #27466: 
[SPARK-30722][PYTHON][DOCS] Update documentation for Pandas UDF with Python 
type hints
URL: https://github.com/apache/spark/pull/27466#discussion_r375588252
 
 

 ##########
 File path: python/pyspark/sql/udf.py
 ##########
 @@ -414,6 +415,9 @@ def _test():
         .appName("sql.udf tests")\
         .getOrCreate()
     globs['spark'] = spark
+    # Hack to skip the unit tests in register. These are currently being 
tested in proper tests.
+    # We should reenable this test once we completely drop Python 2.
+    del pyspark.sql.udf.UDFRegistration.register
 
 Review comment:
   To doubly make sure, I tested and checked:
   
   -  that it doesn't affect the main codes:
   
     ```
     >>> help(spark.udf.register)
     ```
   
     ```
     Help on method register in module pyspark.sql.udf:
     
     register(name, f, returnType=None) method of 
pyspark.sql.udf.UDFRegistration instance
     ...
     ```
   
   - the generated doc too just to make sure.
   
   - the tests pass.

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