uwe at thetaphi
Nov 17, 2009, 1:37 AM
Post #2 of 2
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The PriorityQueue is fixed size, it cannot grow (please note, it is *not*
Java's PQ, ist an own one!).
TopDocs will contain only n documents in it's scoreDocs array, the reported
total hit count will return all matches!
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Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe [at] thetaphi
> -----Original Message-----
> From: Cristian Vat [mailto:cristian.vat [at] gmail]
> Sent: Tuesday, November 17, 2009 10:33 AM
> To: java-user [at] lucene
> Subject: javadoc questions/inconsistencies
>
> Hello all,
>
> Sorry if this is offtopic or already discussed/documented somewhere.
>
> Regarding lucene 2.9.1 javadoc:
>
> In Searcher the method "TopDocs search(Query query, int n)" says "Finds
> the
> top n hits for query."
> However if I do a search(someQuery, 100) which gets me 1000 results all
> results are available, so it doesn't actually limit the hit count to N.
>
> What I saw from the code is that the N is actually the initial size of a
> PriorityQueue, but which gets expanded dynamically. So actually the N
> doesn't limit anything.
> (My initial case, although I might be the only one doing that, was that I
> wanted all results so I put an absurdly large number as N. All I got of
> course was slower searches because a bigger priority queue had to be
> initialized).
>
> -
> Cristian Vat
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