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From Niels Ott <>
Subject Re: Combining keyword queries with database-style queries
Date Fri, 24 Oct 2008 11:26:16 GMT

this RangeQuery thing looks promising. It might be a bit hacky but it 
will most probably do the job in the given time and framework.

Thanks a lot,


Erick Erickson schrieb:
> Well, assuming that token_count is an indexed field
> in your documents (i.e. not something you're
> computing on the fly), just use a RangeQuery for the numeric
> part. Actually, you probably want to use
> ConstantScoreRangeQuery...
> The only thing you have to watch is that Lucene does a
> lexical compare, so you have to index your numbers
> as comparable strings, probably left-padding to some
> fixed width with zeros, see NumberTools.
> Best
> Erick
> On Thu, Oct 23, 2008 at 8:27 AM, Niels Ott <>wrote:
>> Hi everybody,
>> I need to query for documents not only for search terms but also for
>> numeric values (or other general types). Let me try to explain with a
>> hypothetical example.
>> Assuming there is a value for the number words in each document (or the
>> number of person names, or whatever), I would want to formulate a query
>> like "Give me documents containing 'jack johnson' AND with token_count >
>> 250".
>> I've been working with Lucene before and the keyword part is easy, but
>> what would be a good solution to query for numbers etc.?
>> One first idea I had was storing the numbers (which are basically a
>> HashMap<String,Double>) in the index in some way or the other. But it is
>> not at all obvious for me how to query them then.
>> Another thing I could think of would be using a separate database of any
>> type, but then how to bring those two together in a way that makes sense?
>> Any pointers to useful resources and any types of hints are welcome! :-)
>> Best,
>>  Niels

Niels Ott
Computational Linguist (B.A.)

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