alamb commented on pull request #8660:
URL: https://github.com/apache/arrow/pull/8660#issuecomment-727983561


   > @alamb it might be necessary to fallback to generating an array where the 
scalar value is repeated, for some operations that do not have a version which 
accepts a scalar argument
   
   @yordan-pavlov  I agree with this plan. While long term I would like to see 
the ability to evaluate *every* function with constant arguments, that is 
definitely beyond the scope of this PR, and so keeping the fall back to 
constant arrays is a good idea. 
   
   Given how important this functionality is, I suggest we focus on getting 
this PR into master as soon as possible and then iterating on additional 
functionality like additional function support, converting to canonical `expr 
_op_ colref` form, constant folding, hoisting ColumValue into arrow, etc. There 
is so much great work to do!


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