I don't like the pattern - taken from Lucene - but I have never encountered a major performance problem.
C Sent from my iPhone On 14 Jan 2010, at 20:24, "Nicholas Paldino [.NET/C# MVP]" <[email protected] > wrote: > DIGY, > > In .NET it's more than small. Throwing and catching an exception > (which is required here) is orders of magnitude slower than just > returning a > value. It has to do with the stack unwind and restoration, and I'm > sure > it's similar in Java. > > - Nick > > -----Original Message----- > From: Digy [mailto:[email protected]] > Sent: Thursday, January 14, 2010 2:44 PM > To: [email protected] > Subject: RE: at least one doc > > I also have thought many times why HitCollector.Collect doesn't > return a > boolean value indicating no more results are needed. > Maybe, a small performance increment. > > DIGY > > -----Original Message----- > From: Nicholas Paldino [.NET/C# MVP] > [mailto:[email protected]] > Sent: Thursday, January 14, 2010 8:09 PM > To: [email protected] > Subject: RE: at least one doc > > Wow, that's just... Horrible from a design perspective. Doesn't > matter which language it's implemented in. > > - Nick > > -----Original Message----- > From: Digy [mailto:[email protected]] > Sent: Thursday, January 14, 2010 12:22 PM > To: [email protected] > Subject: RE: at least one doc > > The formal way is throwing exception in the HitCollector.Collect to > stop > iteration. > > DIGY > > -----Original Message----- > From: Artem Chereisky [mailto:[email protected]] > Sent: Thursday, January 14, 2010 1:16 AM > To: [email protected]; [email protected] > Subject: at least one doc > > Hi, > > Given a boolean query and/or a filter, what is the best way to see > if there > is at least one matching document? > > I tried a simple hit collector which sets a flag on the first Collect > method. Ideally I would want to stop collecting at that point but I > couldn't > find a way of doing that. > I also tried: TopDocs docs = _searcher.Search(query, filter, 1), but > it > seems to iterate through all matches as docs.totalHits is set the > the actual > number of matches. > > So, is there a better way > > Regards, > Art
