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https://issues.apache.org/jira/browse/LUCENE-7299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298343#comment-15298343
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Yonik Seeley commented on LUCENE-7299:
--------------------------------------

bq.  So this is just for integers. 

No, MSB variations are fine for strings... you go byte-by-byte, just as you 
would for integers, with each byte determining the appropriate bucket.
I imagine this would have a weakness for large common prefixes.  Random strings 
may be the best case since it equally distributed between buckets (hence does a 
maximum amount of work on each pass).

> BytesRefHash.sort() should use radix sort?
> ------------------------------------------
>
>                 Key: LUCENE-7299
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7299
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7299.patch
>
>
> Switching DocIdSetBuilder to radix sort helped make things significantly 
> faster. We should be able to do the same with BytesRefHash.sort()?



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