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Date: Wed, 26 Sep 2007 09:21:53 +0000 (GMT)
From: mark harwood <markharw00d@yahoo.co.uk>
Subject: Re: Wildcard vs Term query
To: java-user@lucene.apache.org
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Message-ID: <870466.47683.qm@web26013.mail.ukl.yahoo.com>

Are you using the out of the box Lucene QueryParser?  It will automatically=
 detect wildcard queries by the presence of * or ? chars.=0AIf the user inp=
ut does not contain these characters a plain TermQuery is used.=0A=0ABoolea=
nQuery.setMaxClauseCount can be used to control the upper limit on terms pr=
oduced by Wildcard/Fuzzy Queries.=0AIf this limit is exceeded (e.g when sea=
rching for something like "a*" ) then an exception is thrown.=0A=0ACheers=
=0AMark=0A----- Original Message ----=0AFrom: John Byrne <john.byrne@propyl=
on.com>=0ATo: java-user@lucene.apache.org=0ASent: Wednesday, 26 September, =
2007 9:48:17 AM=0ASubject: Wildcard vs Term query=0A=0AHi,=0A=0AI'm working=
 my way through the Lucene In Action book, and there is one =0Athing I need=
 explained that I didn't find there;=0A=0AWhile wildcard queries are potent=
ially slower than ordinary term =0Aqueries, are they slower even if theyt d=
on't contain a wildcard? =0ASignificantly slower?=0A=0AThe reason I ask is =
that if we assume we are going to allow wildcards in =0Aa search engine, bu=
t we want to optimize, to take advantage of  when =0Athey are NOT used, do =
we have to check for the presence of "*" or "?" in =0Athe term, and create =
the most appropriate query, or can I assume that =0Awhen a wildcard is not =
present, the WildcardQuery will be as fast (or =0Aalmost as fast) a a plain=
 term query?=0A=0AThanks in advance!=0AJohn B.=0A=0A-----------------------=
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va-user-help@lucene.apache.org=0A=0A=0A=0A=0A=0A=0A      __________________=
_________________________________________=0AYahoo! Answers - Got a question=
? Someone out there knows the answer. Try it=0Anow.=0Ahttp://uk.answers.yah=
oo.com/ 

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