itholic opened a new pull request #33735:
URL: https://github.com/apache/spark/pull/33735
### What changes were proposed in this pull request?
This PR proposes to fix `Series.astype` when converting datetime to
StringDtype, to match the behavior of pandas 1.3.
In pandas < 1.3,
```python
>>> pd.Series(["2020-10-27 00:00:01", None],
name="datetime").astype("string")
0 2020-10-27 00:00:01
1 NaT
Name: datetime, dtype: string
```
This is changed to
```python
0 2020-10-27 00:00:01
1 <NA>
Name: datetime, dtype: string
```
in pandas >= 1.3, so we follow the behavior of latest pandas.
### Why are the changes needed?
Because pandas-on-Spark always follow the behavior of latest pandas.
### Does this PR introduce _any_ user-facing change?
Yes, the behavior is changed to latest pandas when converting datetime to
nullable string (StringDtype)
### How was this patch tested?
Unittest passed
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