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From Chris Hostetter <>
Subject Re: get distinct values of one field from query
Date Thu, 26 Mar 2009 18:36:22 GMT

: In my project I have a query that can possibly return several millions of
: documents.
: >From these documents I always want the unique values from a certain field.
: For the sake of clarity we can take for example the "id" field.

what you are describing sounds similar to the general concept of "faceted 
searching" also frequently discussed on teh mailing lists under the 
question of "category counts" ... in your specific case however it seems 
you don't care about the "counts" just the "categories" (ie: the distinct 
set of values for a field across all matched documents)

given those search terms, i'm guessing you'll find more then enough 
information on the basic approaches that can be taken to tackle a faceting 
problem with any varient of Lucene.


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