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Date: Thu, 21 Aug 2008 10:36:44 -0700 (PDT)
From: "Oleg Gnatovskiy (JIRA)" <jira@apache.org>
To: solr-dev@lucene.apache.org
Subject: [jira] Issue Comment Edited: (SOLR-236) Field collapsing
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    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624421#action_12624421 ] 

oleg_gnatovskiy edited comment on SOLR-236 at 8/21/08 10:34 AM:
----------------------------------------------------------------

I was able to hack the latest patch in, and to get it to work, but it required some pretty heavy naive changes...

If you are getting an NPE try this: in the SolrIndexSearcher class, in the getDocListC method change out = new DocListAndSet(); to

DocListAndSet out = null;
    if(qr.getDocListAndSet() == null)
        out = new DocListAndSet();
    else
        out = qr.getDocListAndSet();

      was (Author: oleg_gnatovskiy):
    I was able to hack the latest patch in, and to get it to work, but it required some pretty heavy naive changes...
  
> Field collapsing
> ----------------
>
>                 Key: SOLR-236
>                 URL: https://issues.apache.org/jira/browse/SOLR-236
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>            Assignee: Otis Gospodnetic
>             Fix For: 1.4
>
>         Attachments: field-collapsing-extended-592129.patch, field_collapsing_1.1.0.patch, field_collapsing_1.3.patch, field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, solr-236.patch
>
>
> This patch include a new feature called "Field collapsing".
> "Used in order to collapse a group of results with similar value for a given field to a single entry in the result set. Site collapsing is a special case of this, where all results for a given web site is collapsed into one or two entries in the result set, typically with an associated "more documents from this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=48&amid=299
> The implementation add 3 new query parameters (SolrParams):
> "collapse.field" to choose the field used to group results
> "collapse.type" normal (default value) or adjacent
> "collapse.max" to select how many continuous results are allowed before collapsing
> TODO (in progress):
> - More documentation (on source code)
> - Test cases
> Two patches:
> - "field_collapsing.patch" for current development version
> - "field_collapsing_1.1.0.patch" for Solr-1.1.0
> P.S.: Feedback and misspelling correction are welcome ;-)

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