zeroshade commented on PR #1036:
URL: https://github.com/apache/arrow-go/pull/1036#issuecomment-5193731349

   @tom-eon The actual bug is the compression-blind cost check, which only 
makes sense when the data is uncompressed. Could we gate this fallback on 
"compression is Uncompressed", or otherwise make it codec-aware, so we fix the 
misprediction on the common compressed case? We can keep the per-column opt-out 
option you've added, but adding the codec-aware default would fix this for 
everyone without requiring users to find and use this knob.
   
   The PR in general looks good otherwise.


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