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https://issues.apache.org/jira/browse/LUCENE-3444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated LUCENE-3444:
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Attachment: LUCENE-3444.patch
Updated patch. I've split the DistinctCountCollector into abstract base class
and a term based implementation. This allows other implementations such as IDV
and function based implementations.
> Distinct field value count per group
> ------------------------------------
>
> Key: LUCENE-3444
> URL: https://issues.apache.org/jira/browse/LUCENE-3444
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/grouping
> Reporter: Martijn van Groningen
> Attachments: LUCENE-3444.patch, LUCENE-3444.patch
>
>
> Support a second pass collector that counts unique field values of a field
> per group.
> This is just one example of group statistics that one might want.
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