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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621470#action_12621470
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Matthias Epheser commented on SOLR-236:
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I just tried to apply the last patch and ran into 2 issues:
First:
The new getDocListAndSet(Query query, List<Query>..) method in
SolrIndexSearcher calls the getDocListC(..) method using the old signature. I
changed the call to the new signature and it worked very well:
DocListAndSet ret = new DocListAndSet();
QueryResult queryResult = new QueryResult();
queryResult.setDocListAndSet(ret);
queryResult.setPartialResults(false);
QueryCommand queryCommand = new QueryCommand();
queryCommand.setQuery(query);
queryCommand.setFilterList(filterList);
queryCommand.setFilter(docSet);
queryCommand.setSort(lsort);
queryCommand.setOffset(offset);
queryCommand.setLen(len);
queryCommand.setFlags(flags |= GET_DOCSET);
getDocListC(queryResult, queryCommand);
Second:
After adding more docs (~3000), I got an Exception in SolrIndexSearcher at line
~1300:
qr.setDocSet(filter == null ? qDocSet : qDocSet.intersection(filter));
As the NegotiatedDocSet doesn't implement the iterator() function, this call
lead to an Unsupported Operation exception. I just naively tried to implement
this funtion using "return source.iterator()". Works fine for me.
As the first issue is very clear, I wanted to check my approach for the second
one before I post a patch. Maybe there are some side effects that I missed.
> 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, 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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