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https://issues.apache.org/jira/browse/SOLR-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13623965#comment-13623965
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Yonik Seeley commented on SOLR-4647:
------------------------------------

It should be really easy to add docvalues based fields to
TestGroupingSearch.testRandomGrouping
                
> Grouping is broken on docvalues-only fields
> -------------------------------------------
>
>                 Key: SOLR-4647
>                 URL: https://issues.apache.org/jira/browse/SOLR-4647
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.2
>            Reporter: Adrien Grand
>              Labels: newdev
>
> There are a few places where grouping uses 
> FieldType.toObject(SchemaField.createField(String, float)) to translate a 
> String field value to an Object. The problem is that createField returns null 
> when the field is neither stored nor indexed, even if it has doc values.
> An option to fix it could be to use the ValueSource instead to resolve the 
> Object value (similarily to NumericFacets).

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