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From Brian Johnson <>
Subject Composition of multiple smaller fields into another larger field?
Date Tue, 06 May 2008 18:53:13 GMT
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:
   <field name="city" type="string" indexed="true" stored="true" />
   <field name="state" type="string" indexed="true" stored="true" />
   <field name="zipcode" type="string" indexed="true" stored="true" />

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.

   <field name="suggest_full" type="prefix_full" indexed="true" stored="true"/>
   <field name="suggest_token" type="prefix_token" indexed="true" 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.
    <composeField source="{city}, {state} {zipcode}" dest="suggest_full"  />
Here source is formatted similar to Velocity templates.
    <composeField source="$city, $state $zipcode" dest="suggest_full"  />

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.

    <composeField template="template_filename.vm" dest="suggest_full" class="solr.VelocityTemplateFactory"

    template_filename.vm file contains the following line
    $city, $state $zipcode

Any feedback would be appreciated.


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