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From Steven Rowe <sar...@syr.edu>
Subject Re: negative queries
Date Fri, 15 Jun 2007 14:00:35 GMT
Hi Antony,

Antony Sequeira wrote:
> In the attached test file I am using string queries and showing the
> failure case.

The attachment didn't make it for some reason.

> Basically I get the impression that I can not have a clause like
> +(-x:y) anywhere in my query.

What follows assumes that the "+(...)" wraps the user input, and is your
attempt to work around the exclusively-negative-query problem.

You can directly use MatchAllDocsQuery[1], or you can use Yonik Seeley's
fix to allow this kind of thing in QueryParser syntax[2] (the "*:*"
construct, which inserts a MatchAllDocsQuery for you), first available
in release 2.1 -- something like "*:* -x:y" should do the trick for you.

Did the *:* construct ever make it into the docs?  I see the patch for
LUCENE-723 doesn't contain any doc changes.  This should be mentioned in
the QP syntax documentation[3], shouldn't it?  And I think Daniel Noll
is right, this looks like an FAQ.

Steve

[1]
<http://lucene.apache.org/java/2_1_0/api/org/apache/lucene/search/MatchAllDocsQuery.html>
[2] <http://issues.apache.org/jira/browse/LUCENE-723>
[3] <http://lucene.apache.org/java/docs/queryparsersyntax.html>

-- 
Steve Rowe
Center for Natural Language Processing
http://www.cnlp.org/tech/lucene.asp

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