john.byrne at therogueprocess
Oct 17, 2008, 12:42 AM
Post #2 of 2
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Hi,
I think you'll normally get quicker answers for this type of question on
the main Lucene users mailing list: java-user[at]lucene.apache.org
Anyway, you just need to call the QueryParser method
'setAllowLeadingWildcard(true)' to allow leading wildcards.
However, once you do that, your leading wildcard queries will probably
expand into many terms, and you should also therefore call
'BooleanQuery.setMaxClauseCount' with a large number - you could use
Integer.MAX_VALUE, but as far as I know this can cause a problem if you
use FuzzyQuerys. The number of terms in your index is the largest you'll
need - but presumably that can grow.
I would just set it at 1 million or something like that. You're problaby
never going to have a million terms.
-John
ChadDavis wrote:
> I need to do a query where i'm looking for strings that are embedded into a
> single word in one of the fields. In other words, a field my have a phrase
> like:
>
> Bob,Tom,Kevin,Jeff
>
> or
>
> Tom,Doug,Steven,Bob
>
>
> I would like to be able to use the wildcard query to search for any document
> that has the name "Tom" embedded, in any fashion, in this field.
>
> I would like to have built a WildCardQuery like "*Tom*", but it doesn't
> accept * as the first character, due to performance reasons the
> documentation explains.
>
> So, how do I do such a query? I'm looking into the fuzzy logic query, right
> now.
>
>
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