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https://issues.apache.org/jira/browse/SOLR-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615967#comment-13615967
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David Arthur commented on SOLR-4647:
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I ran into this as well. For me, grouping was working for int fields, but not
string fields.
Here is the exception I got: https://gist.github.com/mumrah/7d87999e59cfa716f045
> 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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