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From Otis Gospodnetic <otis_gospodne...@yahoo.com>
Subject Re: Composition of multiple smaller fields into another larger field?
Date Wed, 07 May 2008 03:03:33 GMT
Brian,

I think most people would just manipulate the data prior to sending it to Solr for indexing....
but you don't want that.
Your composeField proposal looks fine to me - I can't think of a problem there.  It sounds
like you are asking about the language/syntax for field specification.  Could/should you not
use the ${fifi} syntax?  We already use that in solrconfig.xml, for example.

Otis
--
Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch

----- Original Message ----
> From: Brian Johnson <brianmjohnson@yahoo.com>
> To: solr-user@lucene.apache.org
> Sent: Tuesday, May 6, 2008 2:53:13 PM
> Subject: Composition of multiple smaller fields into another larger field?
> 
> I am interested in using the suggest feature against a composition of other more 
> granular facets. Let me provide an example to help explain my problem and 
> proposed approaches.
> 
> Say I have a set of facets for these artifacts:
>    
>    
>    
> 
> So far things work OK. Now I want my suggest feature to work on a composition 
> equivalent to 
> 
>     {city}, {state} {zipcode}
> 
> I have these fields defined per the suggestions on adding suggest capabilities. 
> I'm experimenting so I am trying both options.
> 
>    
>    
> stored="true"/>
> 
> I would like to 'compose' the value for these 2 suggest fields based on the 
> existing 'atomic' fields. The copyField feature doesn't get me the whole way 
> there but I am interested in a similar mechanism.
> 
> 1) Is there an existing feature, approach, mechanism, ... to get this done that 
> I'm just not aware of?
> 
> 2) Assuming that #1 is 'no', then would this be a generally useful feature to 
> add in? If so how would people like this to be done? 
> 
> Obviously I can push this down into the document preparation myself outside of 
> Solr. I would prefer to have a mechanism to handle this in the schema.xml since 
> I don't want to do any real manipulation/transformation of the data elements at 
> this point. Here was an initial thought on what it might look like...
> 
> Here source is formatted similar to
> java.text.MessageFormat but with named rather than indexed
> substitutions so that.
>     
>     
> Here source is formatted similar to Velocity templates.
>     
> 
> I am not interested in creating a new template language or pulling in a new 
> dependency to get this done though (velocity, freemarker, ...) per se. I just 
> want to do some simple composition. If folks think this is a good idea though, 
> it could be setup like this instead.
> 
>     
> class="solr.VelocityTemplateFactory" />
> 
>     template_filename.vm file contains the following line
>     $city, $state $zipcode
> 
> Any feedback would be appreciated.
> 
> Thanks,
> 
> Brian



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