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List:       solr-user
Subject:    Re: query results filter
From:       Babak Farhang <farhang () gmail ! com>
Date:       2011-02-27 7:33:05
Message-ID: AANLkTi==JEH8aLVu+0k51at+xOmgg6-Wu9msVbBrkcP+ () mail ! gmail ! com
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Just stumbled on field collapsing (
http://wiki.apache.org/solr/FieldCollapsing ), which is apparently
slated for inclusion in the next release.
Looks like I should be able to achieve my unique field requirement w/
group.limit=1&group.main=true in the query string.

With regard to the known limitation "Distributed search support for
result grouping has not yet been implemented," does it work
imperfectly with dist search, or does it fail?

-Babak

On Thu, Feb 24, 2011 at 10:20 PM, Babak Farhang <farhang@gmail.com> wrote:
> In my case, I want to filter out "duplicate" docs so that returned
> docs are unique w/ respect to a certain field (not the schema's unique
> field, of course): a "duplicate" doc here is one that has same value
> for a checksum field as one of the docs already in the results. It
> would be great if I could somehow express that w/ a query, but I don't
> think that would be possible.
> 
> On Thu, Feb 24, 2011 at 5:11 PM, Jonathan Rochkind <rochkind@jhu.edu> wrote:
> > Hmm, depending on what you are actually needing to do, can you do it with a \
> > simple fq param to filter out what you want filtered out, instead of needing to \
> > write custom Java as you are suggesting? It would be a lot easier to just use an \
> > fq. 
> > How would you describe the documents you want to filter from the query results \
> > page?  Can that description be represented by a Solr query you can already \
> > represent using the lucene, dismax, or any other existing query? If so, why not \
> > just use a negated fq describing what to omit from the results? \
> >                 ________________________________________
> > From: Babak Farhang [farhang@gmail.com]
> > Sent: Thursday, February 24, 2011 6:58 PM
> > To: solr-user
> > Subject: query results filter
> > 
> > Hi everyone,
> > 
> > I have some existing solr cores that for one reason or another have
> > documents that I need to filter from the query results page.
> > 
> > I would like to do this inside Solr instead of doing it on the
> > receiving end, in the client.  After searching the mailing list
> > archives and Solr wiki, it appears you do this by registering a custom
> > SearchHandler / SearchComponent with Solr.  Still, I don't quite
> > understand how this machinery fits together.  Any suggestions / ideas
> > / pointers much appreciated!
> > 
> > Cheers,
> > -Babak
> > 
> > ~~
> > 
> > Ideally, I'd like to find / code a solution that does the following:
> > 
> > 1. A request handler that works like the StandardRequestHandler but
> > which allows an optional DocFilter (say, modeled like the
> > java.io.FileFilter interface)
> > 2. Allows current pagination to work transparently.
> > 3. Works transparently with distributed/sharded queries.
> > 
> 


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