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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867855#action_12867855
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Varun Gupta commented on SOLR-236:
----------------------------------
I applied the latest patch on the trunk and got the below exception after I
made some commits to the index:
SEVERE: java.lang.NullPointerException
at
org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$FlatValueFieldComparator.compare(NonAdjacentDocumentCollapser.java:450)
at
org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$DoumentComparator.compare(NonAdjacentDocumentCollapser.java:262)
at
org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$DoumentPriorityQueue.lessThan(NonAdjacentDocumentCollapser.java:196)
at org.apache.lucene.util.PriorityQueue.upHeap(PriorityQueue.java:221)
at org.apache.lucene.util.PriorityQueue.add(PriorityQueue.java:130)
at
org.apache.lucene.util.PriorityQueue.insertWithOverflow(PriorityQueu.java:146)
at
org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser.doollapsing(NonAdjacentDocumentCollapser.java:113)
at
org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.execueCollapse(AbstractDocumentCollapser.java:259)
at
org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.collase(AbstractDocumentCollapser.java:179)
at
org.apache.solr.handler.component.CollapseComponent.doProcess(CollapeComponent.java:173)
at
org.apache.solr.handler.component.CollapseComponent.process(Collapseomponent.java:127)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SerchHandler.java:195)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHanderBase.java:131)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1321)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilte.java:341)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFiltr.java:244)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(AppicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationilterChain.java:206)
I also got an error while doing optimizing index.
> 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: Shalin Shekhar Mangar
> 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, DocSetScoreCollector.java,
> 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-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,
> NonAdjacentDocumentCollapser.java, NonAdjacentDocumentCollapserTest.java,
> quasidistributed.additional.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch,
> SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch,
> SOLR-236.patch, SOLR-236.patch, SOLR-236.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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