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https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576613#comment-13576613
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Robert Muir commented on SOLR-3855:
-----------------------------------

Another thing to keep in mind is enforcement of default value. So if this could 
be controlled per-type like lucene too, this would be ideal.

For example multivalued dv type is conceptually a sorted set of ordinals per 
document. It can be empty (doc has 0 ords).
                
> DocValues support
> -----------------
>
>                 Key: SOLR-3855
>                 URL: https://issues.apache.org/jira/browse/SOLR-3855
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.2, 5.0
>
>         Attachments: SOLR-3855.patch, SOLR-3855.patch, SOLR-3855.patch, 
> SOLR-3855.patch
>
>
> It would be nice if Solr supported DocValues:
>  - for ID fields (fewer disk seeks when running distributed search),
>  - for sorting/faceting/function queries (faster warmup time than fieldcache),
>  - better on-disk and in-memory efficiency (you can use packed impls).

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