bjornjorgensen edited a comment on pull request #35296:
URL: https://github.com/apache/spark/pull/35296#issuecomment-1025144269
@zero323 This PR won't have any impact on your first example because there
is at least one value that is not None. In your second example it will be
without this PR.
```bash
df = ps.DataFrame.from_dict({"id": [1, 2], "val": [np.nan, np.nan]})
df
id val
0 1 NaN
1 2 NaN
df.to_json("testdf.json", num_files=1)
df2 = ps.read_json("testdf.json/*")
df2
id val
0 1 None
1 2 None
df2.to_json("testdf2.json", ignoreNullFields=True, num_files=1)
df3 = ps.read_json("testdf2.json/*")
df3
id
0 1
1 2
```
I will change what we agree on, but for now I think this has something to do
with None values.
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