vibhatha commented on PR #13397:
URL: https://github.com/apache/arrow/pull/13397#issuecomment-1160959973

   > I probably shouldn't be turning Scalar into an Array anyway (i.e., I 
should probably just do what the Python UDFs do and pass a `list()` of 
arguments).
   
   I think we can consider an Scalar as an array of length 1 and keep all 
inputs represented as list which could be converted to an Array in a 
straightforward manner (I assume R-Arrow C++ API has utils for that). 
   
   In Python UDF PR, I modified it based on some of the suggestions with a bit 
deeper context as far as compute API usage is considered. 


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