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From "Erick Erickson" <erickerick...@gmail.com>
Subject Re: Range queries in Lucene - numerical or lexicographical
Date Mon, 13 Aug 2007 13:19:24 GMT
Uhhhh, because I didn't write the code? You can always contribute a patch.

On 8/13/07, Mohammad Norouzi <mnrz57@gmail.com> wrote:
>
> 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
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
> >
>
>
> --
> Regards,
> Mohammad
> --------------------------
> see my blog: http://brainable.blogspot.com/
> another in Persian: http://fekre-motefavet.blogspot.com/
>

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