bjornjorgensen commented on a change in pull request #35296:
URL: https://github.com/apache/spark/pull/35296#discussion_r794889539



##########
File path: python/pyspark/pandas/generic.py
##########
@@ -980,6 +983,9 @@ def to_json(
         """
         if "options" in options and isinstance(options.get("options"), dict) 
and len(options) == 1:
             options = options.get("options")
+        
+        default_options: Dict[str, Any] = {"ignoreNullFields": False}
+        options = {**default_options, **options}

Review comment:
       #dev/reformat-python
   reformatted python/pyspark/pandas/generic.py
   All done! ✨ 🍰 ✨
   1 file reformatted, 367 files left unchanged.
   
   Now flake8 print F821 undefined name 'Dict' 
   This error is a bug in pyflakes [Why does flake8 give the warning f821 
undefined name match when using 
match](https://stackoverflow.com/questions/67547135/why-does-flake8-give-the-warning-f821-undefined-name-match-when-using-match)
 We can add # noqa: F821 but then we need to remove this when pyflakes is 
fixed. I don’t think we should do that. 
   I have tested this manually. With 
[bjornjorgensen/spark-notebook:spark-test260122](https://hub.docker.com/layers/bjornjorgensen/spark-notebook/spark-test260122/images/sha256-4738a07b6605b6d84875a2dd604760b67f841ccf2167ec18440df3b11583de3f?context=repo&tab=layers)
 docker image. 
   
   `data = {'col_1': [3, 2, 1, 0], 'col_2': [None, None, None, None]}
   test = ps.DataFrame.from_dict(data)
   
   test.to_json("test.json")
   
   test2 = ps.read_json("test.json/*")
   test2
   
        col_1   col_2
   0    3       None
   1    2       None
   2    1       None
   3    0       None
   
   test2.to_json("test2.json", ignoreNullFields=True)
   
   test3 = ps.read_json("test2.json/*")
   test3
   
        col_1
   0    3
   1    2
   2    1
   3    0`




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