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https://issues.apache.org/jira/browse/SOLR-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035635#comment-13035635
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Michael McCandless commented on SOLR-2526:
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I think LUCENE-3099 could make this possible, by allowing subclasses to define
arbitrary group keys per document. Today the grouping module is "hardwired" to
use BytesRef (pulled from FieldCache of a single-valued indexed field) as the
group key, but really it should be able to be any key.
> Grouping on multiple fields
> ---------------------------
>
> Key: SOLR-2526
> URL: https://issues.apache.org/jira/browse/SOLR-2526
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 4.0
> Reporter: Arian Karbasi
> Priority: Minor
>
> Grouping on multiple fields and/or ranges should be an option (X,Y)
> groupings.
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