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https://issues.apache.org/jira/browse/LUCENE-7071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182317#comment-15182317
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Robert Muir commented on LUCENE-7071:
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I think its ok since its package-private. We should avoid doing this kind of
copying in a comparison function!
> Can we reeduce excessive byte[] copying in OfflineSorter?
> ---------------------------------------------------------
>
> Key: LUCENE-7071
> URL: https://issues.apache.org/jira/browse/LUCENE-7071
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master, 6.1
>
> Attachments: LUCENE-7071.patch
>
>
> OfflineSorter, which dimensional points uses heavily in the > 1D case,
> works by reading one partition, a set of N unsorted values, from disk
> and sorting it in memory and writing it out again.
> The sort invokes a provided {{Comparator}} on two {{BytesRef}} values,
> each of which is fully copied from the {{ByteBlockPool}}, when it could
> often reference a slice from the pool instead.
> Another byte[] copy happens when iterating through the sorted values.
> This is an optimization ... I'm targeting 6.1.0 not 6.0.0!
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