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https://issues.apache.org/jira/browse/LUCENE-3444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109540#comment-13109540
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Martijn van Groningen edited comment on LUCENE-3444 at 9/21/11 2:45 PM:
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Attached initial version of a second pass collector that counts the unique
field values per group for a specific field.
was (Author: martijn.v.groningen):
Attached initial version of a second pass collector that count the unique
field values per group for a specific field.
> 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
>
>
> 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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