Github user lins05 commented on the issue:
https://github.com/apache/spark/pull/16533
What about also support using the type name without the parentheses, as a
syntax sugar? e.g.:
```python
@udf(returnType =IntegerType) # instead of IntegerType()
def f(...):
...
```
It can be achieved by checking if the returnType is a subclass of DataType:
```python
if isinstance(returnType, type) and DataType in returnType.__mro__:
returnType = returnType()
else ...
```
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