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From "Erick Erickson" <>
Subject Re: Combining keyword queries with database-style queries
Date Thu, 23 Oct 2008 12:47:20 GMT
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

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.


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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