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From "Emmanuel Keller (JIRA)" <>
Subject [jira] Updated: (SOLR-236) Field collapsing
Date Sat, 19 May 2007 14:26:16 GMT


Emmanuel Keller updated SOLR-236:

    Attachment: field_collapsing_1.1.0.patch

I still maintain a version for the release 1.1.0 (The version we used on our production environment).

> Field collapsing
> ----------------
>                 Key: SOLR-236
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.2
>            Reporter: Emmanuel Keller
>         Attachments: collapse_field.patch, collapse_field.patch, field_collapsing.patch,
field_collapsing.patch, field_collapsing.patch, field_collapsing_1.1.0.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 4 new query parameters (SolrParams):
> "collapse" set to true to enable collapsing.
> "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

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