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https://issues.apache.org/jira/browse/LUCENE-4904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626982#comment-13626982
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Adrien Grand commented on LUCENE-4904:
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We can add this ReverseOrderSorter, but as far as NumericDocValuesSorter is
concerned, I would rather have the abstraction at the level of the
DocComparator rather than the Sorter. This would allow
{{Sorter.sort(int,DocComparator)}} to quickly return null without allocating
(potentially lots of) memory for the doc maps if the reader is already sorted.
Additionally, this would allow for more readable diagnostics (such as
"DocValues(fieldName,desc)" instead of "Reverse(DocValues(fieldName,asc))".
> Sorter API: Make NumericDocValuesSorter able to sort in reverse order
> ---------------------------------------------------------------------
>
> Key: LUCENE-4904
> URL: https://issues.apache.org/jira/browse/LUCENE-4904
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Trivial
> Labels: newdev
> Fix For: 4.3
>
> Attachments: LUCENE-4904.patch, LUCENE-4904.patch, LUCENE-4904.patch
>
>
> Today it is only able to sort in ascending order.
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