Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18945#discussion_r134925269
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -1762,7 +1762,7 @@ def toPandas(self):
else:
--- End diff --
If we use this approach, how about the following to check if the type
corrections are needed:
```python
dtype = {}
for field in self.schema:
pandas_type = _to_corrected_pandas_type(field.dataType)
if pandas_type is not None and not(field.nullable and
pdf[field.name].isnull().any()):
dtype[field.name] = pandas_type
```
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