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https://issues.apache.org/jira/browse/SOLR-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035683#comment-13035683
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Martijn van Groningen commented on SOLR-2526:
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Or maybe this: if we get LUCENE-2883 in as module and figure out how should
group by function. Then we only need a function that concatenates field values.
For the ranges we can use a function that assigns a range value to field value:
ranges([fieldName], [gap], [start], [end])
> 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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