xinrong-meng opened a new pull request, #41485:
URL: https://github.com/apache/spark/pull/41485
### What changes were proposed in this pull request?
Use pandas ExtensionDtype for integral Series with Nulls after Arrow to
Pandas conversion.
### Why are the changes needed?
More reasonable results after Arrow to Pandas conversion.
### Does this PR introduce _any_ user-facing change?
No behavior changes, only the `na` in the string representation becomes
`<NA>`.
```py
df = spark.createDataFrame([1, None], schema='int')
# FROM
>>> df.select(pandas_udf(lambda x: x.astype(str), 'string')('value')).show()
+---------------+
|<lambda>(value)|
+---------------+
| 1|
| nan|
+---------------+
# TO
>>> df.select(pandas_udf(lambda x: x.astype(str), 'string')('value')).show()
+---------------+
|<lambda>(value)|
+---------------+
| 1|
| <NA>|
+---------------+
```
### How was this patch tested?
Unit tests.
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