[GitHub] [arrow] jonkeane commented on pull request #11225: ARROW-13112: [R] altrep vectors for strings and other types

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jonkeane commented on pull request #11225:
URL: https://github.com/apache/arrow/pull/11225#issuecomment-928256318


   Ok, I've finally had a chance to run these. The results for strings are super impressive. The difference was so much I had to widen some of these plots to even see the difference between no altrep and altrep versions.
   
   Interestingly(?) it looks like dictionaries are also using altrep too (though there doesn't seem to be any performance difference between them). _Note_ the @HEAD and @7f7f72d branches did not return successfully not because there was a failure, but because the objects didn't pass [the altrep checking that {arrowbench} does](https://github.com/ursacomputing/arrowbench/blob/main/R/bm-array-to-vector.R#L67-L76). I need to dig more in and manually investigate what's going on there.
   
   [altvec-with-strings.html.zip](https://github.com/apache/arrow/files/7239176/altvec-with-strings.html.zip)


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