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List:       lucene-user
Subject:    Re: Wildcard searches and BooleanQuery$TooManyClauses
From:       Otis Gospodnetic <otis_gospodnetic () yahoo ! com>
Date:       2003-11-25 21:15:23
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Correct.
As for side-effect, well, things will be slower, obviously :)
Increase the limit, perform a search, and see if it's still
sufficiently fast...that's what I would do. :)

Otis

--- Dror Matalon <dror@zapatec.com> wrote:
> 
> This was raised in 
> 
>
http://www.mail-archive.com/lucene-user@jakarta.apache.org/msg04696.html
> 
> and not really answered.
> 
> 
> If I do 
> 
> +(contents:luc* description:luc*)
> 
> Things work fine. However if I do 
> +(contents:car* description:car*)
> 
> I get the following exception
> 
> 
> org.apache.lucene.search.BooleanQuery$TooManyClauses
> &lt;/pre&gt;
> &lt;h4&gt;------------start of original exception stack
> trace-------&lt;/h4&gt;
> &lt;pre&gt;
> org.apache.lucene.search.BooleanQuery$TooManyClauses
> 	at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:109)
> 	at org.apache.lucene.search.BooleanQuery.add(BooleanQuery.java:101)
> 	at org.apache.lucene.search.PrefixQuery.rewrite(PrefixQuery.java:85)
> 	at
> org.apache.lucene.search.BooleanQuery.rewrite(BooleanQuery.java:240)
> 	at
>
org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:189)
> 	at org.apache.lucene.search.Query.weight(Query.java:120)
> 	at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:128)
> 	at org.apache.lucene.search.Hits.getMoreDocs(Hits.java:93)
> 	at org.apache.lucene.search.Hits.&amp;lt;init&amp;gt; (Hits.java:80)
> 	at org.apache.lucene.search.Searcher.search(Searcher.java:71)
> 	at org.apache.lucene.search.Searcher.search(Searcher.java:65)
> 	at com.fastbuzz.search.Results.fetchResults(Results.java:134)
> 	at com.fastbuzz.search.Results.&amp;lt;init&amp;gt; (Results.java:
>   ...
> 
> 
> My guess is that wild cards are rewriten as a bunch of
> BooleanQuery(s)
> so that car* is actually
> car
> cars
> carma
> ...
> 
> Since I have more than 1024 terms in my index that start with car, I
> get
> this exception. 
> 
> What are the performence reprecussions to increasing maxClauseCount
> from
> 1024 to something large, say 64K?
> 
> 
> Regards,
> 
> Dror
> 
> -- 
> Dror Matalon
> Zapatec Inc 
> 1700 MLK Way
> Berkeley, CA 94709
> http://www.fastbuzz.com
> http://www.zapatec.com
> 
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