rok commented on PR #12528:
URL: https://github.com/apache/arrow/pull/12528#issuecomment-1149746730

   > @rok I'm not sure how to take a decision based on these graphs. We care 
about monotonicity in UTC timestamps, right? The graph don't seem to show a 
particular problem in that case.
   
   The graphs are to supplement testing as we can cover bigger parameter space 
and see if results make sense.
   
   The `preserve_wall` option preserves monotonicity in wall time as well by 
flattening part of ambiguous periods. I suppose we only need monotonicity in 
UTC so `preserve_wall` can be removed and introduced if asked for. What would 
you be in favour of?
   
   > TBH, I'm starting to question the entire idea of rounding in local time. 
What are the use cases?
   
   Use case would be something like when do users form a certain country come 
to my website. Rounding in UTC would be inconsistent. I believe it is a needed 
feature.


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