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From "Charles Hornberger (JIRA)" <>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Thu, 10 Jan 2008 01:12:37 GMT


Charles Hornberger commented on SOLR-236:

Doug -- I just started looking into field collapsing the other day, but from glancing at the
code in and, it seems like perhaps you're not supposed
to be using both components -- after all, their prepare() methods are identical, and their
process() methods both execute the user's search and shove the resulting DocList into the
"response" entry of the response object's internal storage Map. (The QueryComponent additionally
stores the DocListAndSet in the ResponseBuilder object via builder.setResults() -- I'm not
sure why this is -- and prefetches documents if the result set is small enough.) My guess
is that if you want to enable collapsing, you should use the CollapseComponent; if you want
to disable it, use the QueryComponent. Maybe someone who understand the design of the search
handling components better than me can confirm this or correct my misunderstanding(s) ...

> Field collapsing
> ----------------
>                 Key: SOLR-236
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>         Attachments: field-collapsing-extended-592129.patch, field_collapsing_1.1.0.patch,
field_collapsing_1.3.patch, field_collapsing_dsteigerwald.diff, SOLR-236-FieldCollapsing.patch,
SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.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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