romainfrancois commented on pull request #10445:
URL: https://github.com/apache/arrow/pull/10445#issuecomment-857603402


   I've used `arrow.use_altrep` but I can use `arrow.altrep` all the same. 
   
   I've put `GetBoolOption("arrow.altrep", true)` after the 
`array->null_count() == 0` because it's cheaper to call `null_count()`. 
   
   `GetBoolOption("arrow.altrep", true)` means that this is opt-out, I'm fine 
with this but it might be risky. 
   


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