HyukjinKwon opened a new pull request #34028:
URL: https://github.com/apache/spark/pull/34028


   ### What changes were proposed in this pull request?
   
   This PR adds the support of understanding `numpy.typing` package that's 
added from NumPy 1.21.
   
   ### Why are the changes needed?
   
   For user-friendly return type specification in type hints for function apply 
APIs in pandas API on Spark.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, this PR will enable users to specify return type as 
`numpy.typing.NDArray[...]` to internally specify pandas UDF's return type.
   
   For example,
   
   ```python
   TBD
   ```
   
   ```
   TBD
   ```
   
   ### How was this patch tested?
   
   Unittest was added. I will add e2e test after 
https://github.com/apache/spark/pull/34007.


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