Distinct field value count per group
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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
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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