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https://issues.apache.org/jira/browse/LUCENE-3099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033688#comment-13033688
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Martijn van Groningen commented on LUCENE-3099:
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All the current group collectors use currently DocTermsIndex. With function
queries I think this can't be used. However changing this requires changing the
collectors in many places. So I think the getGroupKey() method isn't enough.
Solr uses the MutableValue to abstract away the source of the values. I'm not
sure what we can use in Lucene to have this abstraction.
> Grouping module should allow subclasses to set the group key per document
> -------------------------------------------------------------------------
>
> 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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