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From Erik Hatcher <>
Subject Re: faceted browsing
Date Thu, 30 Mar 2006 20:39:28 GMT

Thanks for the recommendations.  It's reassuring to know I was on the  
right track in realizing that a custom SolrRequestHandler was needed  
to accomplish this.

Now I need to investigate the flexibility of the solrconfig.xml - can  
custom parameters be set there, such that a custom SolrRequestHandler  
could read them?   For example, I'd want to list the field names that  
are the "facets", such that counts for each of those are returned  
with each query.


On Mar 29, 2006, at 1:46 PM, Yonik Seeley wrote:

> Solr has a lot of support to do faceted browsing, but one must
> currently write a custom query handler to implement the faceting
> logic.
> The support includes:
>   - custom query handlers:
>   - the ability to return more data than just a list of documents
>   - a filter cache with autowarming, for fast access to the filter for
> each facet
>   - more memory efficient and faster intersecting filter  
> representations
> The part I want in the future is simple faceted browsing without
> having to write any plugins or Java code..  so we need to come up with
> a syntax to represent the desired faceting operations, and then
> implement that syntax in the standard request handler.
> To implement a custom query handler, you need to implement  
> SolrRequestHandler
> SolrRequestHandler.html
> and register it in solrconfig.xml
> -Yonik
> On 3/29/06, Erik Hatcher <> wrote:
>> I saw Yonik mentioned faceted browsing as something coming in the
>> future of Solr, but I had thought it was one of the initial features
>> from seeing this announcement ages ago:
>>         < 
>> Product-Category-Listings-t266441.html#a748420>
>> If facets are part of the current Solr codebase, how are they
>> configured and returned in the response?
>> If they aren't currently possible with Solr, what would it take to
>> implement it?
>> I'm still, obviously, just scratching the surface of Solr as I
>> evaluate it for replacing my custom XML-RPC based search server which
>> does rudimentary facets using Filters and BitSet operations.
>> By faceted browsing, a Query is used to search, Hits are returned,
>> but also based on a subset of the fields (indexed, untokenized
>> fields) the number of documents in each of these "facet" fields is
>> returned as well to show counts by each facet.
>> Thanks,
>>         Erik

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