I'm not using the QueryParser at all. I need to do a little more with
the terms, so i'm explicitly creating a Query from a single term. What I
was hoping was to avoid something like this:
...
if(term.contains("*") || terms.contains("?") {
return new WildcardQuery(...
}
else {
return new TermQuery(...
...
and instead just go like this:
...
return new WilcardQuery(...
...
on the basis that the WildacardQuery would only be slower if it does
contain a wildcard character. But as you pointed out, the QueryParser
makes this optimization, so I suppose I should too.
mark harwood wrote:
Are you using the out of the box Lucene QueryParser? It will automatically
detect wildcard queries by the presence of * or ? chars.
If the user input does not contain these characters a plain TermQuery is used.
BooleanQuery.setMaxClauseCount can be used to control the upper limit on terms
produced by Wildcard/Fuzzy Queries.
If this limit is exceeded (e.g when searching for something like "a*" ) then an
exception is thrown.
Cheers
Mark
----- Original Message ----
From: John Byrne <[EMAIL PROTECTED]>
To: java-user@lucene.apache.org
Sent: Wednesday, 26 September, 2007 9:48:17 AM
Subject: Wildcard vs Term query
Hi,
I'm working my way through the Lucene In Action book, and there is one
thing I need explained that I didn't find there;
While wildcard queries are potentially slower than ordinary term
queries, are they slower even if theyt don't contain a wildcard?
Significantly slower?
The reason I ask is that if we assume we are going to allow wildcards in
a search engine, but we want to optimize, to take advantage of when
they are NOT used, do we have to check for the presence of "*" or "?" in
the term, and create the most appropriate query, or can I assume that
when a wildcard is not present, the WildcardQuery will be as fast (or
almost as fast) a a plain term query?
Thanks in advance!
John B.
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