if you have many terms across the fields, you might want to invoke IndexReader's setTermInfosIndexDivisor() method, which would reduce the in memory term infos used to lookup idf, but a (slightly) slower search.
> From: [EMAIL PROTECTED] > To: java-user@lucene.apache.org > Subject: Re: Is it possible to get only one Field from a Document? > Date: Wed, 11 Jun 2008 08:22:22 -0400 > > For the record, Hits.id(int i) returns the document number. Note, > though, that Hits is now deprecated, as pointed out by the link to > 1290, so going the TopDocs route is probably better anyway. > > -Grant > > On Jun 11, 2008, at 7:43 AM, Daan de Wit wrote: > > > This is possible, you need to provider a FieldSelector to > > IndexReader#document(docId, selector). This won't work with Hits > > though, because Hits does not expose the document number, so you > > need to roll your own solution using TopDocs or HitCollector, for > > information see the discussion in this issue: > > https://issues.apache.org/jira/browse/LUCENE-1290 > > > > Kind regards, > > Daan de Wit > > > > -----Original Message----- > > From: Marcelo Schneider [mailto:[EMAIL PROTECTED] > > Sent: Wednesday, June 11, 2008 13:29 > > To: java-user@lucene.apache.org > > Subject: Is it possible to get only one Field from a Document? > > > > I have a environment where we have indexed a DB with about 6mil > > entries > > with Lucene, and each row has 25 columns. 20 cols have integer codes > > used as filters (indexed/unstored), and the other 5 have (very) large > > texts (also indexed/unstored). Currently the search I'm doing is > > like this: > > > > Hits hits = searcher.search(query); > > for (int i = 0; i < this.hits.length(); i++) { > > Document doc = this.hits.doc(i); > > String s = doc.get("fieldWanted"); > > // does everything with the result, etc > > } > > > > We are trying to reduce memory usage, however. Is it possible to > > return > > a Document object with just the Fields I really need? In the example, > > each Document have 25 fields, and I just need one... would this > > theoretically make any difference? > > > > > > > > > > -- > > > > Marcelo Frantz Schneider > > SIC - TCO - Tecnologia em Engenharia do Conhecimento > > DÍGITRO TECNOLOGIA > > E-mail: [EMAIL PROTECTED] > > Site: www.digitro.com > > > > > > -- > > Esta mensagem foi verificada pelo sistema de antivírus da Dígitro e > > acredita-se estar livre de perigo. > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > -------------------------- > Grant Ingersoll > http://www.lucidimagination.com > > Lucene Helpful Hints: > http://wiki.apache.org/lucene-java/BasicsOfPerformance > http://wiki.apache.org/lucene-java/LuceneFAQ > > > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > _________________________________________________________________ 隨身的 Windows Live Messenger 和 Hotmail，不限時地掌握資訊盡在指間 — Windows Live for Mobile http://www.msn.com.tw/msnmobile/
