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From "Martijn van Groningen (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3099) Grouping module should allow subclasses to set the group key per document
Date Sun, 29 May 2011 22:00:47 GMT


Martijn van Groningen updated LUCENE-3099:

    Attachment: LUCENE-3099.patch

Attached an updated patch.

I'm currently busy with integrating the grouping module in trunk Solr. I noticed that FirstPassGroupingCollector
and SecondPassGroupingCollector still has groupField as field and constructor argument. So
I moved this to TermsFirstPassGroupingCollector and TermSecondPassGroupingCollector. Also
made a small change in GroupDocs regarding generics.

> Grouping module should allow subclasses to set the group key per document
> -------------------------------------------------------------------------
>                 Key: LUCENE-3099
>                 URL:
>             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, 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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