jonkeane commented on pull request #11225:
URL: https://github.com/apache/arrow/pull/11225#issuecomment-930177590


   > @jonkeane oh I see. It's only the levels attribute that is an altrep. This 
is nice, but I'm sure we can (in a follow up pull request) also make the 
integer vector an altrep: https://issues.apache.org/jira/browse/ARROW-14169
   
   Yeah, I've already [made a PR to 
{arrowbench}](https://github.com/ursacomputing/arrowbench/pull/40) to fix this 
using your suggestion and it does now successfully catch that the factors 
themselves are not altrep. It is kinda cool that this all _just worked_ with 
the levels vector — I wouldn't have expected that (and it's not a _huge_ deal 
or hugely helpful, though I guess it could be for factors with super large 
string levels?) but cool that it _just worked_.


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