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https://issues.apache.org/jira/browse/SOLR-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley updated SOLR-2068:
-------------------------------

    Attachment: SOLR-2068.patch

Here's a draft patch (completely untested) that implements the phase2 
specialization:

bq.  at the start of each segment, look up the ords for the values and hash the 
group based on that ord (or leave it out of the hash if it didn't exist in that 
segment).


> Search Grouping: collapse by string specialization
> --------------------------------------------------
>
>                 Key: SOLR-2068
>                 URL: https://issues.apache.org/jira/browse/SOLR-2068
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Yonik Seeley
>         Attachments: SOLR-2068.patch, SOLR-2068.patch, SOLR-2068.patch
>
>
> Create specialized implementations for collapsing by an indexed string field.

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