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Date: Tue, 29 Dec 2009 14:44:30 +0000 (UTC)
From: "Grant Ingersoll (JIRA)" <jira@apache.org>
To: solr-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=3D127950=
63#action_12795063 ]=20

Grant Ingersoll commented on SOLR-236:
--------------------------------------

bq. I'm curious as to whether anyone has just thought of using the Clusteri=
ng component for this? If your "collapse" field was a single token, I wonde=
r if you would get the results you're looking for.

I would note, in looking at the Carrot2 code, they actually have a ByFieldC=
lusteringAlgorithm (what they call synthetic clustering) which does field c=
ollapsing/clustering on a value of a field.  To quote the javadocs:
{quote}
Clusters documents into a flat structure based on the values of some field =
of the
documents. By default the {@link Document#SOURCES} field is used
{quote}
and
{quote}
  * Name of the field to cluster by. Each non-null scalar field value with =
distinct
     * hash code will give raise to a single cluster, named using the
     * {@link Object#toString()} value of the field. If the field value is =
a collection,
     * the document will be assigned to all clusters corresponding to the v=
alues in the
     * collection. Note that arrays will not be 'unfolded' in this way.
     *=20
{quote}

I don't know how it performs, but it seems like it would at least be worth =
investigating.

Note, they also have a synthetic one for collapsing based on URL: ByUrlClus=
teringAlgorithm

Just food for thought.

> 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, field-collapse-3.patch, field-collapse-4-wit=
h-solrj.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-5.patch, field-collapse-5.patch, =
field-collapse-solr-236-2.patch, field-collapse-solr-236.patch, field-colla=
psing-extended-592129.patch, field_collapsing_1.1.0.patch, field_collapsing=
_1.3.patch, field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwa=
ld.diff, field_collapsing_dsteigerwald.diff, quasidistributed.additional.pa=
tch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-2=
36-FieldCollapsing.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.patch, S=
OLR-236.patch, SOLR-236.patch, solr-236.patch, SOLR-236_collapsing.patch, S=
OLR-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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