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From: "Uwe Schindler" <uwe@thetaphi.de>
To: <java-user@lucene.apache.org>
References: <1287186677922-1712290.post@n3.nabble.com>
 <AANLkTik8UOgc7hhm6w2GHFMn50NS_3d9hhsUd7V-UQAT@mail.gmail.com>
In-Reply-To: <AANLkTik8UOgc7hhm6w2GHFMn50NS_3d9hhsUd7V-UQAT@mail.gmail.com>
Subject: RE: API that return the amount of terms indexed
Date: Sat, 16 Oct 2010 11:52:01 +0200
Message-ID: <003e01cb6d17$c813d750$583b85f0$@thetaphi.de>
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Hi Mike,

As far as I know, 3.0 also has this method:
http://lucene.apache.org/java/3_0_2/api/core/org/apache/lucene/index/Inde=
xRe
ader.html#getUniqueTermCount()

But it also only works on segment level, too! So you have to use
getSequentialSubReaders/ReaderUtil.gatherSubReaders() and do it per =
segment.
But to get the unique count for the whole index, there is no way around
iterating every term, as duplicates must be removed (which TermEnum =
does).

Uwe

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: Michael McCandless [mailto:lucene@mikemccandless.com]
> Sent: Saturday, October 16, 2010 11:17 AM
> To: java-user@lucene.apache.org
> Subject: Re: API that return the amount of terms indexed
>=20
> 4.0 will have an API to get the number of unique terms for a given =
field,
or
> across all fields, but only at the segment level.  (Getting the count
across
> segments requires a merge sort).
>=20
> 3.x and before doesn't have such an API, though the information is =
tracked
> under the hood.  If you open the _X.tis file, skip the first int, then
call
> readLong(), that should be the number of unique terms in that segment.
>=20
> You can always simply fallback to getting the term enum and stepping
counting
> how many .next()'s there are until exhaustion...
>=20
> Mike
>=20
> On Fri, Oct 15, 2010 at 7:51 PM, APOLO_11 <barhen.dan@gmail.com> =
wrote:
> >
> > hey - is there an API that return the number of term indexed?
> >
> > I found =A0the API return the amount of document indexed
> > (IndexWriter.docCount) but cant find an API for the amount of terms =
in
> > the index.
> >
> > any idea ?
> >
> > thanks,d.
> > --
> > View this message in context:
> > =
http://lucene.472066.n3.nabble.com/API-that-return-the-amount-of-terms
> > -indexed-tp1712290p1712290.html Sent from the Lucene - Java Users
> > mailing list archive at Nabble.com.
> >
> > =
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> >
>=20
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