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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656337#action_12656337
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Stephen Weiss commented on SOLR-236:
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Yes, this is basically what I'm doing for now... At least it's reasonable
enough to explain to a client that the counts are for unfilitered results.
However, ideally, it should be able to facet properly on filitered results as
well...
Also, with simply collapse.facet=before, the results returned are the
unfilitered results. You *have* to specify collapse.facet=after to get
filtered results at all, and run the query component right before the facet
component then to get the unfilitered facet counts... which doesn't seem to be
ideal. This is with release version of SOLR 1.3 and Iván's most recent patch.
All in all it took a lot of experimenting but at least now I have a method that
works that we can go live with and then we'll just update the software as the
situation improves.
Thanks for all your efforts on the patch! I complain but really, the fact it
works at all is a miracle for us.
> 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
> Fix For: 1.4
>
> Attachments: collapsing-patch-to-1.3.0-ivan.patch,
> collapsing-patch-to-1.3.0-ivan_2.patch,
> 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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