Grouping module should allow subclasses to set the group key per document
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Key: LUCENE-3099
URL: https://issues.apache.org/jira/browse/LUCENE-3099
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
Fix For: 3.2, 4.0
The new grouping module can only group by a single-valued indexed field.
But, if we make the 'getGroupKey' a method that a subclass could override, then
I think we could refactor Solr over to the module, because it could do function
queries and normal queries via subclass (I think).
This also makes the impl more extensible to apps that might have their own
interesting group values per document.
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