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Date: Wed, 11 May 2011 21:25:47 +0000 (UTC)
From: "Martijn van Groningen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-1421) Ability to group search results by
 field
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    [ https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032082#comment-13032082 ] 

Martijn van Groningen commented on LUCENE-1421:
-----------------------------------------------

Nice work Michael! I also think that the two pass mechanism is definitely the preferred way to go. 

I think we also need a strategy mechanism (or at least an GroupCollector class hierarchy) inside this module. The mechanism should select the right group collector(s) for a certain request. Some users maybe only care about the top group document, so I second pass won't be necessary. Another example with faceting in mind. When group based faceting is necessary. The top N groups don't suffice. You'll need all group docs (I currently don't see a other way). These groups docs are then used to create a grouped Solr DocSet. But this should be a completely different implementation. 

> Ability to group search results by field
> ----------------------------------------
>
>                 Key: LUCENE-1421
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1421
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>            Reporter: Artyom Sokolov
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>         Attachments: LUCENE-1421.patch, lucene-grouping.patch
>
>
> It would be awesome to group search results by specified field. Some functionality was provided for Apache Solr but I think it should be done in Core Lucene. There could be some useful information like total hits about collapsed data like total count and so on.
> Thanks,
> Artyom

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