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From "Martijn van Groningen (JIRA)" <>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Tue, 16 Jun 2009 17:57:08 GMT


Martijn van Groningen commented on SOLR-236:

The LocalSolrQueryComponent and the CollapseComponent are both doing a search, that is why
there are two result sets. 
I think if you want field collapsing and local search you cannot use the version of localsolr
that you are currently using, but you can use the latest
local solr patch (SOLR-773). The latest patch does local search in a different manner, the
DistanceCalculatingComponent (LocalSolrQueryComponent is removed) self does not do a search,
but it adds a filter query (based on the lat, long and radius) to the normal search, that
is then executed in the collapse component, so it should work in the way you expect it.

Example configuration for the latest patch:
<searchComponent name="geodistance" class="org.apache.solr.spatial.tier.DistanceCalculatingComponent"
<queryParser name="spatial_tier" class="org.apache.solr.spatial.tier.SpatialTierQueryParserPlugin"
<requestHandler name="geo" class="org.apache.solr.handler.component.SearchHandler">
	<lst name="defaults">  
		<str name="echoParams">explicit</str>  
		<str name="defType">spatial_tier</str>  
	<lst name="invariants">  
		<str name="latField">lat</str>  
		<str name="lngField">lng</str>  
		<str name="distanceField">geo_distance</str>  
		<str name="tierPrefix">_tier_</str>  
       <arr name="components">
	<arr name="last-components">  

> Field collapsing
> ----------------
>                 Key: SOLR-236
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>             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, 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, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
SOLR-236-FieldCollapsing.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."
> 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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