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Date: Wed, 1 Jun 2011 19:25:50 +0000 (UTC)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-3099) Grouping module should allow
 subclasses to set the group key per document
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    [ https://issues.apache.org/jira/browse/LUCENE-3099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042377#comment-13042377 ] 

Michael McCandless commented on LUCENE-3099:
--------------------------------------------

I think we are close here!  It's great to see you're able to cutover
Solr trunk to the grouping module based on this.

Random things:

  * I think we can in fact use Map<...> instead of HashMap<...> in 2nd
    pass abstract collector?

  * Can you add @SuppressWarnings("unchecked") for the generic array
    creations?

  * Can you fix the other generics warnings?  Eg the copy-ctor in
    TopGroups, and TestGrouping has a few warnings.  ("ant clean
    compile-test" should show all these warnings).

  * The class in AllGroupsCollectorTest needs to be renamed

  * OK, let's leave groupDocs as protected in the 2nd pass collector
    (remove the nocommit/your response).

  * For AbstractAllGroupsCollector, can we impl the getGroupCount in
    the base class as getGroups.size()?


> 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, 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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