It's not efficient, because you cannot get it efficient as of overlapping terms (as noted before).
----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: kannan chandrasekaran [mailto:ckanna...@yahoo.com] > Sent: Thursday, May 27, 2010 11:01 PM > To: java-user@lucene.apache.org > Subject: Re: How to get the number of unique terms in the inverted index > > Hi Yonik, > > Thanks for the quick response. I am curious as to why this is not supported > whereas the numdocs() is supported ? Even in the upcoming version its only > supported per segment and not across the index, why ? Is it difficult to > implement efficiently ? > > Pardon my ignorance if I am missing something thats very obvious... > > Thanks > Kannan > > On Thu, May 27, 2010 at 2:32 PM, kannan chandrasekaran > <ckanna...@yahoo.com> wrote: > > I was wondering if there is a way to retrieve the number of unique > > terms in the lucene > ( version 2.4.0) ... I am aware of the terms() && terms(Term) method that > returns an enumeration (TermEnum) but that involves iterating through the > terms and couting them. > I looking for something similar to numdocs() in the IndexReader class. > > No there is not. > In 4.0-dev, with the new "flex" APIs, you can retrieve the number of unique > terms in a single segment (Terms.getUniqueTermCount()), but not a whole > index. > > -Yonik > http://www.lucidimagination.com > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
