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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765605#action_12765605
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Aytek Ekici commented on SOLR-236:
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Hi Martijn,
Intersection of results sets is also a kind of "AND", right? Intersection 
result of A docset and B docset is equal to resultset of "conA AND condB" i 
think.

Your suggestion "fq=lat:[37.2 TO 39.8] AND lng:[24.5 TO 29.9]" works. And also 
Anil's suggestion "fq=+lat:[37.2 TO 39.8] +lng:[24.5 TO 29.9]" works. 
But they don't allow multiple selections for a facet field. I can't use 
excludes. It throws parsing errors. 
Using "AND" between two filters in a filter query results with one item in 
FilterList of QueryCommand, that must be the reason not to be able to 
parse/support ex/tag things there i guess.

I have two solr instances here one with patch and another without patch. And i 
just copied configurations and data from one to other. Only difference is 
field_collapsing patch as i can see. I'm trying to see what makes the 
difference in results but new in solr so it takes time to see/catch what is 
going on. So any help/tip would be appreciated.

Thanks,
Aytek

> 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
>             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-3.patch, 
> field-collapse-4-with-solrj.patch, field-collapse-5.patch, 
> field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, 
> field-collapse-5.patch, field-collapse-5.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."
> 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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