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From "Eric Caron (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Thu, 29 Apr 2010 18:29:02 GMT

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862327#action_12862327
] 

Eric Caron commented on SOLR-236:
---------------------------------

Using the latest from trunk as of 2010-04-29, and the SOLR-236-trunk.patch from 2010-03-29
05:08, I get a nullpointerexception whenever I use collapse.field and a fq.

Works:
/solr/select/?q=sales&fq=country%3A1
Works:
/solr/select/?q=sales&collapse.field=company
Doesn't work:
/solr/select/?q=sales&collapse.field=company&fq=country%3A1

The top of the trace is:
java.lang.NullPointerException
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$FloatValueFieldComparator.compare(NonAdjacentDocumentCollapser.java:450)
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$DocumentComparator.compare(NonAdjacentDocumentCollapser.java:262)
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$DocumentPriorityQueue.lessThan(NonAdjacentDocumentCollapser.java:196)
	at org.apache.lucene.util.PriorityQueue.insertWithOverflow(PriorityQueue.java:148)
	at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser.doCollapsing(NonAdjacentDocumentCollapser.java:113)
	at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.executeCollapse(AbstractDocumentCollapser.java:259)
	at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.collapse(AbstractDocumentCollapser.java:179)
	at org.apache.solr.handler.component.CollapseComponent.doProcess(CollapseComponent.java:173)
	at org.apache.solr.handler.component.CollapseComponent.process(CollapseComponent.java:127)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:195)

> 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.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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