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From "Mohammad Norouzi" <mnr...@gmail.com>
Subject Re: Range queries in Lucene - numerical or lexicographical
Date Mon, 13 Aug 2007 05:10:22 GMT
Thanks Erick but unfortunately NumberTools works only with long primitive
type I am wondering why you didn't put some method for double and float.



On 8/13/07, Nilesh Bansal <nileshbansal@gmail.com> wrote:
>
> Thanks. Probably this should be mentioned on the documentation page.
>
> -Nilesh
>
> On 8/12/07, Erick Erickson <erickerickson@gmail.com> wrote:
> > As has been discussed several times, Lucene is a string-only engine, and
> > has no native understanding of numerical values. You have to normalize
> > them for string searches. See NumberTools.
> >
> > Best
> > Erick
> >
> > On 8/11/07, Nilesh Bansal <nileshbansal@gmail.com> wrote:
> > >
> > > Hi all,
> > >
> > > Lucene query parser synax page
> > > (http://lucene.apache.org/java/docs/queryparsersyntax.html) provides
> > > the following two examples of range query:
> > > mod_date:[20020101 TO 20030101]
> > > and
> > > title:{Aida TO Carmen}
> > >
> > > Now my question is, numerically 10 is greater than 2, but in
> > > string-only comparison 2 is greater than 10. So if I search for
> > > field:[10 TO 30]
> > > will a document with field=2 will be in result or not.
> > >
> > > And if I search for a string field,
> > > field:[AA TO CC]
> > > will document with field="B" will be in result or not.
> > >
> > > The semantics of range is not clear (numerical or lexicographical)
> > > from the documentation.
> > >
> > > thanks
> > > Nilesh
> > >
> > > --
> > > Nilesh Bansal.
> > > http://queens.db.toronto.edu/~nilesh/
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > >
> > >
> >
>
>
> --
> Nilesh Bansal.
> http://queens.db.toronto.edu/~nilesh/
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
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>
>


-- 
Regards,
Mohammad
--------------------------
see my blog: http://brainable.blogspot.com/
another in Persian: http://fekre-motefavet.blogspot.com/

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