CurtHagenlocher commented on PR #37388:
URL: https://github.com/apache/arrow/pull/37388#issuecomment-1734781255

   I also could go either way. It's hard to predict the kind of scenarios that 
people might care about but I think the lower precision of DateTime vs nanos 
makes it a suboptimal fit anyway. Users who need the performance could do the 
conversion on the outside and then use the overload for appending an int64 
directly.
   
   That said, there are other places in the code where multiplication happens 
e.g. GetTimestampUnchecked (for a different meaning of "unchecked") and I don't 
know how to describe a policy for when these should be checked and when they 
shouldn't be.


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