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From Grant Ingersoll <gsing...@apache.org>
Subject Re: aggregation in lucene
Date Wed, 17 Dec 2008 03:01:50 GMT
See Solr's faceting capabilities.  http://lucene.apache.org/solr and  
the wiki from there.  Faceting is built right in.


On Dec 16, 2008, at 3:53 PM, RobertV wrote:

>
> Does anyone know how to retrieve aggregated results from lucene? Is is
> possible to do something similar to this SQL statement below, which  
> returns
> the numbers of books for each author for books published in 2007-2008?
>
> select count(*), author_name
> from book
> where published_date >= '2007-01-01'
> and published_date <= '2008-12-31'
> group by author_name
>
> Note: I do NOT want to loop through every document to get these  
> totals.
> Also note the "group by" and I am using two fields (author_name and
> published_date) so a simple TermEnum does not cut it.
>
> Thanks.
> -- 
> View this message in context: http://www.nabble.com/aggregation-in-lucene-tp21041575p21041575.html
> Sent from the Lucene - General mailing list archive at Nabble.com.
>

--------------------------
Grant Ingersoll

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