[jira] [Updated] (LUCENE-3444) Distinct field value count per group

["Martijn van Groningen (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martijn van Groningen updated LUCENE-3444:
------------------------------------------

    Attachment: LUCENE-3444.patch

Updated the patch and added a docvalues based implementation.

Things to do:
* Add implementation that uses MutableValue.
* Add random tests.
                
> 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, 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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