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https://issues.apache.org/jira/browse/SOLR-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12900846#action_12900846
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Yonik Seeley commented on SOLR-1682:
------------------------------------

No, with the current algorithm we avoid keeping all of the groups in memory at 
once, so we never know exactly how many unique ones we hit.  But an option to 
retrieve it is a good idea - we probably just don't want to do it by default.


> Implement CollapseComponent
> ---------------------------
>
>                 Key: SOLR-1682
>                 URL: https://issues.apache.org/jira/browse/SOLR-1682
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>            Reporter: Martijn van Groningen
>            Assignee: Shalin Shekhar Mangar
>             Fix For: Next
>
>         Attachments: field-collapsing.patch, SOLR-1682.patch, 
> SOLR-1682.patch, SOLR-1682.patch, SOLR-1682.patch, SOLR-1682.patch, 
> SOLR-1682.patch, SOLR-1682.patch, SOLR-1682_prototype.patch, 
> SOLR-1682_prototype.patch, SOLR-1682_prototype.patch, SOLR-236.patch
>
>
> Child issue of SOLR-236. This issue is dedicated to field collapsing in 
> general and all its code (CollapseComponent, DocumentCollapsers and 
> CollapseCollectors). The main goal is the finalize the request parameters and 
> response format.

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