HyukjinKwon commented on a change in pull request #35296:
URL: https://github.com/apache/spark/pull/35296#discussion_r790349225
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File path: python/pyspark/pandas/generic.py
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@@ -904,6 +904,8 @@ def to_json(
.. note:: output JSON format is different from pandas'. It always use
`orient='records'`
for its output. This behaviour might have to change in the near
future.
+
+ .. note:: If column have only NaN or Null values. The column well be
deleted.
Review comment:
There's `ignoreNullFields` option to control this behaviour. If pandas
writes both in JSON, we will have to set this as `False` by default, and
document this.
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