WillAyd commented on PR #15041:
URL: https://github.com/apache/arrow/pull/15041#issuecomment-1371244885

   Gotcha - was going back in my head to thinking we wanted to measure the 
bytes allocated to the null array mask for all types, but if that's not the 
case makes sense on the fixed vs variable width types. I
   
   So then I think this is in a good spot? Not sure if we wanted to go crazy 
with templating versus branching in the dedicated string function to set the 
`bytes_processed`. And within the string function I am branching with a 
`array->null_bitmap() == nullptr)` condition - I didn't see a clear winner of 
that versus `array->null_count() > 0` in the code base so not sure that matters


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