Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18945
I agree with @BryanCutler in general. `None` makes more sense to me to
infer the type in this case.
Another rough thought for a feasible way I could think to keep the current
behaviour (to be more specific, to match the types with / without Arrow
optimization, IIUC) is, to make a generator wrapper to check if `None` exists
in the results for columns where the type is int and nullable.
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