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Date: Thu, 29 Apr 2010 14:29:02 -0400 (EDT)
From: "Eric Caron (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-236) Field collapsing
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    [ https://issues.apache.org/jira/browse/SOLR-236?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D128623=
27#action_12862327 ]=20

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=3Dsales&fq=3Dcountry%3A1
Works:
/solr/select/?q=3Dsales&collapse.field=3Dcompany
Doesn't work:
/solr/select/?q=3Dsales&collapse.field=3Dcompany&fq=3Dcountry%3A1

The top of the trace is:
java.lang.NullPointerException
=09at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$Flo=
atValueFieldComparator.compare(NonAdjacentDocumentCollapser.java:450)
=09at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$Doc=
umentComparator.compare(NonAdjacentDocumentCollapser.java:262)
=09at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser$Doc=
umentPriorityQueue.lessThan(NonAdjacentDocumentCollapser.java:196)
=09at org.apache.lucene.util.PriorityQueue.insertWithOverflow(PriorityQueue=
.java:148)
=09at org.apache.solr.search.fieldcollapse.NonAdjacentDocumentCollapser.doC=
ollapsing(NonAdjacentDocumentCollapser.java:113)
=09at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.execut=
eCollapse(AbstractDocumentCollapser.java:259)
=09at org.apache.solr.search.fieldcollapse.AbstractDocumentCollapser.collap=
se(AbstractDocumentCollapser.java:179)
=09at org.apache.solr.handler.component.CollapseComponent.doProcess(Collaps=
eComponent.java:173)
=09at org.apache.solr.handler.component.CollapseComponent.process(CollapseC=
omponent.java:127)
=09at org.apache.solr.handler.component.SearchHandler.handleRequestBody(Sea=
rchHandler.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-p=
atch-to-1.3.0-ivan.patch, collapsing-patch-to-1.3.0-ivan_2.patch, collapsin=
g-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-col=
lapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collap=
se-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.p=
atch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patc=
h, 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, Non=
AdjacentDocumentCollapser.java, NonAdjacentDocumentCollapserTest.java, quas=
idistributed.additional.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-Fie=
ldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-trunk.patch, S=
OLR-236-trunk.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, SOLR-2=
36.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, solr-236.patch, S=
OLR-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 gi=
ven 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 docum=
ents from this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=3D48&amid=3D299
> 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 c=
ollapsing
> 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 ;-)

--=20
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