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https://issues.apache.org/jira/browse/LUCENE-3099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039444#comment-13039444
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Martijn van Groningen commented on LUCENE-3099:
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In order to avoid double FC usage we need to let the grouping collectors
instantiate the right fieldcache for the right field.
The current collectors always create a StringIndex (3.x) or DocTermsIndex
(4.0). When you sort on the same field as you group and this field is for
example an int. Then a complete new StringIndex / DocTermsIndex is put in the
FieldCache.
> 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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