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https://issues.apache.org/jira/browse/LUCENE-3099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated LUCENE-3099:
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Attachment: LUCENE-3099.patch
Attached a new patch that is based on Mike's patch.
* All existing grouping tests pass
* AllGroupsCollector has also been included in this infrastructure.
Only the TermSecondPassGroupingCollector didn't work. The size groupDocs array
was too small.
I think the following things need to be done:
* Update the documentation in package.html
* Backport to 3x
Should we rename all abstract collectors to Abstract*? To make it clear that
these classes are abstract.
> 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
>
> Attachments: LUCENE-3099.patch, LUCENE-3099.patch, LUCENE-3099.patch
>
>
> 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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