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From Daniel Noll <>
Subject Re: NOT queries
Date Tue, 21 Nov 2006 22:26:43 GMT
Antony Bowesman wrote:
> Hi,
> I'm writing a mapping mechanism between an existing search interface and 
> Lucene and wondered how to support a single NOT/- query.
> Given the query "-attribute", then from an ealier comment by Chris 
> Hostetter where he says "you can't have a negative clause in isolation 
> by itself", I assume that you first have to create a BooleanClause that 
> finds everything and then another Clause that removes the "attribute".
> Is this right or is there another way to do it?

That's certainly how we do it... a BooleanClause with a 
MatchAllDocsQuery as default and the desired prohibited query.

You can subclass QueryParser to make this happen automatically (and I 
believe I've posted code about this at least once on the list already.)


Daniel Noll

Nuix Pty Ltd
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