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https://issues.apache.org/jira/browse/LUCENE-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033569#comment-13033569
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Michael McCandless commented on LUCENE-3098:
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I agree we should make it easy to get total number of (unique) groups.
We may want to just fold this into the 1st pass collector since it's already
looking up group ord + value?
> Grouped total count
> -------------------
>
> Key: LUCENE-3098
> URL: https://issues.apache.org/jira/browse/LUCENE-3098
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Martijn van Groningen
> Fix For: 3.2, 4.0
>
>
> When grouping currently you can get two counts:
> * Total hit count. Which counts all documents that matched the query.
> * Total grouped hit count. Which counts all documents that have been grouped
> in the top N groups.
> Since the end user gets groups in his search result instead of plain
> documents with grouping. The total number of groups as total count makes more
> sense in many situations.
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