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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779061#action_12779061
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German Attanasio Ruiz commented on SOLR-236:
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Sorting of results doesn't work properly. Next, I detail the steps I followed
and the problem I faced
I am using solr as a search engine for web pages, from which I use a field
named "site" for collapsing and sort over scord
Steps
After downloading the last version of solr "solr-2009-11-15" and applying the
patch "field-collapse-5.patch 2009-11-15 08:55 PM Martijn van Groningen 239 kB"
STEP 1 - I make a search using fieldcollapsing and the result is correct, the
number with greatest scord is 0.477
STEP 2 - I make the same search and the fieldcollapsing throws other result
with scord 0.17, the (correct) result of step 1 does not appear again
Possible problem
Step 1 stores the document in the cache for future searches
at Step 2 the search is don over the cache and does not find the previously
stored document
Possible solution
I believe that the problem is in the storing of the document in the cache since
if we make step 2 again we have the same result and the document with scord of
0.17 is not removed from the results, the only result removed is the document
with scord 0.477
Conclusion
Documents are not sorted properly when using "fieldcollapsing + solrcache",
that is when documents stored in solr cache are required
> 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: 1.5
>
> Attachments: collapsing-patch-to-1.3.0-dieter.patch,
> collapsing-patch-to-1.3.0-ivan.patch, collapsing-patch-to-1.3.0-ivan_2.patch,
> collapsing-patch-to-1.3.0-ivan_3.patch, field-collapse-3.patch,
> field-collapse-4-with-solrj.patch, field-collapse-5.patch,
> field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
> field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
> field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
> field-collapse-5.patch, field-collapse-solr-236-2.patch,
> field-collapse-solr-236.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, quasidistributed.additional.patch,
> SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-FieldCollapsing.patch, solr-236.patch, SOLR-236_collapsing.patch,
> SOLR-236_collapsing.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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