Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20900
to be clear, I think both functions below
```python
class F(object):
def __call__(...):
...
func = F()
```
```python
def naive_func(a, b):
...
func = partial(naive_func, a=1)
```
should work woth Pandas UDF but seems not working given my test
https://github.com/apache/spark/pull/20900#issuecomment-375949480
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