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https://issues.apache.org/jira/browse/LUCENE-5454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905456#comment-13905456
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Adrien Grand commented on LUCENE-5454:
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+1 I like the approach and the fact that this is an optional API
> SortField for SortedSetDV
> -------------------------
>
> Key: LUCENE-5454
> URL: https://issues.apache.org/jira/browse/LUCENE-5454
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/other
> Reporter: Robert Muir
> Attachments: LUCENE-5454.patch
>
>
> Currently, its not possible to sort by a sortedsetdv (e.g. a multi-valued
> field). So the idea is to provide some comparators that let you do this: by
> choosing a selector (e.g. min/max/median type stuff) that picks a value from
> the set as a representative sort value.
> The implementation is pretty simple, just actually wrap the SortedSet in a
> SortedDV that does the selection, and re-use the existing
> TermOrdValComparator logic.
> One issue is that, with the current sortedset API only 'min' is a viable
> option because its the only one that can be done in constant time. So this
> patch adds an optional extension (RandomAccessOrds) for codecs that can
> support random access. I added this to the default codec, diskdv, and direct,
> as they can all easily support it. While this could be useful for other
> purposes (e.g. min/max as valuesource or whatever), i think its best to be
> optional because it prevents some forms of encoding/compression.
> Anyway I'm targeting lucene/sandbox with this change...
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