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From "Thomas Traeger (JIRA)" <>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Sat, 27 Dec 2008 01:47:44 GMT


Thomas Traeger commented on SOLR-236:

I tested 1.3 and ivans latest patch.

When I add a Filter Query (fq param) to my query I get an exception "Either filter or filterList
may be set in the QueryCommand, but not both.". I'm not that familiar with java but at least
disabled the exception in I can use Filter Queries now and no problems
occured so far. But surely this has to be handled in another way.

Btw, I think this had already been fixed by Karsten back in 2007 in some way (patch field-collapsing-extended-592129.patch).
He commented it with:

"Made a minimal change to SolrIndexSearcher.getDocListC() to support passing both the filter
and filterList parameters. In most cases this was already handled anyway."

> Field collapsing
> ----------------
>                 Key: SOLR-236
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>             Fix For: 1.4
>         Attachments: 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-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
> 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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