HyukjinKwon commented on PR #37360:
URL: https://github.com/apache/spark/pull/37360#issuecomment-1201963930

   Hm, the general idea might be fine but I think the implementation is the 
problem. For example, the current design is that the user defined `function` 
always takes one group for `pdf`. To keep this behaviour, you should send the 
multiple groups into one, and apply the same function multiple times for each 
group.


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