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From "Peter Keegan" <>
Subject Re: Announcement: Lucene powering Monster job search index (Beta)
Date Mon, 30 Oct 2006 16:31:05 GMT

Fields with numeric values are stored in a separate file as binary values in
an internal format. Lucene is unaware of this file and unaware of the range
expression in the query. The range expression is parsed outside of Lucene
and used in a custom HitCollector to filter out documents that aren't in the
requested range(s). A goal was to do this without having to modify Lucene.
Our scheme is pretty efficient, but not very general purpose in its current
form, though.


On 10/30/06, Joe Shaw <> wrote:
> Hi Peter,
> On Fri, 2006-10-27 at 15:29 -0400, Peter Keegan wrote:
> > Numeric range search is one of Lucene's weak points (performance-wise)
> so we
> > have implemented this with a custom HitCollector and an extension to the
> > Lucene index files that stores the numeric field values for all
> documents.
> >
> > It is important to point out that this has all been implemented with the
> > stock Lucene 2.0 library. No code changes were made to the Lucene core.
> Can you give some technical details on the extension to the Lucene index
> files?  How did you do it without making any changes to the Lucene core?
> Thanks,
> Joe
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