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https://issues.apache.org/jira/browse/LUCENE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575381#comment-13575381
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Robert Muir commented on LUCENE-4765:
-------------------------------------

We can consider the IntsRef (i generally try to avoid these *Ref APIs) :)

As far as this field for lucene/facets: I don't think it should be used by 
lucene/facets. That one should continue to use a single-valued byte[] because 
it separately tracks ordinals in a different structure.

                
> Multi-valued docvalues field
> ----------------------------
>
>                 Key: LUCENE-4765
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4765
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Robert Muir
>         Attachments: LUCENE-4765.patch
>
>
> The general idea is basically the docvalues parallel to 
> FieldCache.getDocTermOrds/UninvertedField
> Currently this stuff is used in e.g. grouping and join for multivalued 
> fields, and in solr for faceting.

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