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From tarun sapra <t.sapr...@gmail.com>
Subject Re: A question regarding the setSlop method of class PhraseQuery (Lucene version 3.0.1)
Date Mon, 28 Jun 2010 15:32:34 GMT
Hey Erick

Thanks mate!

So I guess my explanation in the mail chain above was correct!

On Mon, Jun 28, 2010 at 6:20 AM, Erick Erickson <erickerickson@gmail.com>wrote:

> I think you're misunderstanding the intent of PhraseQueries and slop. Slop
> is the number of intervening tokens that may exist between the words
> you're looking for. However, all the words you're looking for MUST exist.
> So,
>
> <<< whenever the search phrase contains a word that don't
> exist in the document, the search result will be empty >>>
>
> is exactly how this is intended to work.
>
> HTH
> Erick
>
>
> On Mon, Jun 28, 2010 at 9:09 AM, a peng <zhoudengpeng@gmail.com> wrote:
>
> > Hi,
> >
> > My test result is that whenever the search phrase contains a word that
> > don't
> > exist in the document, the search result will be empty no matter how big
> > the
> > slop factor I set, seems this is a bug of Lucene, or it is work as
> design?
> >
> > 2010/6/28 tarun sapra <t.sapra97@gmail.com>
> >
> > > Hi ,
> > >
> > > I think I have been able to understand whats happening here...
> > >
> > > Indexed Content : "This is a test".
> > > your search phrase : "This is a formal test"
> > > your setting the slop factor 2 , now if your slop factor is 3 it should
> > > work
> > > because "is" and "a" are stop words thus the words "This" and "test"
> are
> > 2
> > > slop factor apart but in your search phrase "This is a formal test" the
> > > words "This" and "test"  are 3 slop factor thats why it's nor working
> > > now in search phrase "This is formal test" the words "This" and "test"
> > are
> > > 2
> > > slop factor apart thats why this phrase is working.
> > >
> > >
> > >
> > > On Mon, Jun 28, 2010 at 11:37 AM, a peng <zhoudengpeng@gmail.com>
> wrote:
> > >
> > > > Hi,
> > > >
> > > > I am using StandardAnalyzer(Version.LUCENE_30);
> > > >
> > > > 2010/6/27 tarun sapra <t.sapra97@gmail.com>
> > > >
> > > > > which analyzer are you usin'?
> > > > >
> > > > >
> > > > > On Sun, Jun 27, 2010 at 7:12 AM, a peng <zhoudengpeng@gmail.com>
> > > wrote:
> > > > >
> > > > > > Hi,
> > > > > >
> > > > > > I know the indexed content contains the following text: "This
is
> a
> > > > test".
> > > > > > And the search phrase I used is "This is a formal test", and
then
> I
> > > set
> > > > > the
> > > > > > slop of the PhraseQuery as 2 with setSlop(2), but I found that
I
> > can
> > > > not
> > > > > > get
> > > > > > a search result. If I set the search phrase as "This is formal
> > test",
> > > > > then
> > > > > > I
> > > > > > can get the search result.
> > > > > >
> > > > > > So what is the problem here, thanks in advance.
> > > > > >
> > > > > >
> > > > > > Attached is the Java doc for the setSlop method:
> > > > > >
> > > > > > public void *setSlop*(int s)
> > > > > >
> > > > > > Sets the number of other words permitted between words in query
> > > phrase.
> > > > > If
> > > > > > zero, then this is an exact phrase search. For larger values
this
> > > works
> > > > > > like
> > > > > > a WITHIN or NEAR operator.
> > > > > >
> > > > > > The slop is in fact an edit-distance, where the units correspond
> to
> > > > moves
> > > > > > of
> > > > > > terms in the query phrase out of position. For example, to switch
> > the
> > > > > order
> > > > > > of two words requires two moves (the first move places the words
> > atop
> > > > one
> > > > > > another), so to permit re-orderings of phrases, the slop must
be
> at
> > > > least
> > > > > > two.
> > > > > >
> > > > > > More exact matches are scored higher than sloppier matches,
thus
> > > search
> > > > > > results are sorted by exactness.
> > > > > >
> > > > > > The slop is zero by default, requiring exact matches.
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Thanks & Regards
> > > > > Tarun Sapra
> > > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Thanks & Regards
> > > Tarun Sapra
> > >
> >
>



-- 
Thanks & Regards
Tarun Sapra

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