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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600281#action_12600281
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Otis Gospodnetic commented on SOLR-236:
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It's amazing this issue/patch has so many votes and watchers, yet it's stuck...
Ryan, Yonik, Emmanuel, Doug, Charles, Karsten
I think Bojan is onto something here. Isn't the ability to *chain
QueryComponent (QC) and CollapseComponent (CC) essential*?
I'm looking at field_collapsing_dsteigerwald.diff and see that the
*CC.prepare method there is identical to the QC.prepare method*, while process
methods are different. Could we solve this particular copy/paste situation by
*making CC extend QC and simply override the process method*?
As for chaining, could CC take the same approach as the MLT Component, which
simply does it's thing to find "more like this" docs and stuffs them into the
"moreLikeThis" element in the response?
I could be misunderstanding something, so please correct me if I'm wrong. I'd
love to get this one in 1.3 -- it's been waiting in JIRA for too long. :)
> 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
> 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
>
>
> 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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