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From Uri Boness <>
Subject Re: Field Collapsing (was Re: Schema for group/child entity setup)
Date Thu, 03 Sep 2009 20:49:16 GMT
The collapsed documents are represented by one "master" document which 
can be part of the normal search result (the doc list), so pagination 
just works as expected, meaning taking only the returned documents in 
account (ignoring the collapsed ones). As for the scoring, the "master" 
document is actually the document with the highest score in the 
collapsed group.

As for Solr 1.3 compatibility... well... it's very hart to tell. All 
latest patch are certainly *not* 1.3 compatible (I think they're also 
depending on some changes in lucene which are not available for solr 
1.3). I guess you'll have to try some of the old patches, but I'm not 
sure about their stability.


R. Tan wrote:
> Thanks Uri. How does paging and scoring work when using field collapsing?
> What patch works with 1.3? Is it production ready?
> R
> On Thu, Sep 3, 2009 at 3:54 PM, Uri Boness <> wrote:
>> The development on this patch is quite active. It works well for single
>> solr instance, but distributed search (ie. shards) is not yet supported.
>> Using this page you can group search results based on a specific field.
>> There are two flavors of field collapsing - adjacent and non-adjacent, the
>> former collapses only document which happen to be located next to each other
>> in the otherwise-non-collapsed results set. The later (the non-adjacent) one
>> collapses all documents with the same field value (regardless of their
>> position in the otherwise-non-collapsed results set). Note, that
>> non-adjacent performs better than adjacent one. There's currently discussion
>> to extend this support so in addition to collapsing the documents, extra
>> information will be returned for the collapsed documents (see the discussion
>> on the issue page).
>> Uri
>> R. Tan wrote:
>>> I think this is what I'm looking for. What is the status of this patch?
>>> On Thu, Sep 3, 2009 at 12:00 PM, R. Tan <> wrote:
>>>> Hi Solrers,
>>>> I would like to get your opinion on how to best approach a search
>>>> requirement that I have. The scenario is I have a set of business
>>>> listings
>>>> that may be group into one parent business (such as 7-eleven having
>>>> several
>>>> locations). On the results page, I only want 7-eleven to show up once but
>>>> also show how many locations matched the query (facet filtered by state,
>>>> for
>>>> example) and maybe a preview of the some of the locations.
>>>> Searching for the business name is straightforward but the locations
>>>> within
>>>> the a result is quite tricky. I can do the opposite, searching for the
>>>> locations and faceting on business names, but it will still basically be
>>>> the
>>>> same thing and repeat results with the same business name.
>>>> Any advice?
>>>> Thanks,
>>>> R

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