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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karsten Sperling updated SOLR-236:
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Attachment: field-collapsing-extended-592129.patch
I've done some work on the field collapsing patch and made some additions and
changes and posting this patch (against revision 592129) here for discussion.
- Added a collapse.facet = before|after parameter to control if faceting
happens before or after collapsing.
- Changed collapse.max to collapse.threshold -- this value controls after which
number of collapsible hits collapsing actually kicks in (collapse.max is still
supported as an alias).
- Added a collapse.maxdocs parameter that limits the number of documents that
CollapseFilter will process to create the filter DocSet. The intention of this
is to be able to limit the time collapsing will take for very large result sets
(obviously at the expense of accurate collapsing in those cases).
- Inverted the logic of the filter DocSet created by CollapseFilter to contain
the documents that are to be collapsed instead of the ones that are to be kept.
Without this collapse.maxdocs doesn't work.
- Added collapse.info.doc and collapse.info.count parameters to provide more
control over what gets returned in the collapse_counts extra results.
- Made a minimal change to SolrIndexSearcher.getDocListC() to support passing
both the filter and filterList parameters. In most cases this was already
handled anyway.
- Did some general refactoring and added comments and a test case.
If somebody with deeper Solr/Lucene knowledge could review these changes it
would be much appreciated.
Karsten
> 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
> Attachments: field-collapsing-extended-592129.patch,
> field_collapsing_1.1.0.patch, field_collapsing_1.3.patch,
> 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."
> http://www.fastsearch.com/glossary.aspx?m=48&amid=299
> 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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