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Message-ID: <49AF2A30.3080003@nuix.com>
Date: Thu, 05 Mar 2009 12:26:08 +1100
From: Daniel Noll <daniel@nuix.com>
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To: java-user@lucene.apache.org
Subject: Re: Optimum way to find all document without particular field
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Chris Lu wrote:
> Allahbaksh,
> 
> If you ONLY want to find all document with a particular field that is 
> not null, you can loop through the TermEnum and TermDocs to find all the 
> document ids.
> But this can not easily be combined with other queries.

Surely this would be equivalent to a PrefixQuery with a prefix of "". 
Assuming the query parser is well behaved (I can no longer remember 
whether the default one is or not), field:* should create one.

This is assuming you have already indexed the data.  If you can reindex 
then clearly adding a placeholder value for "no content" is more efficient.

Daniel


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Daniel Noll                            Forensic and eDiscovery Software
Senior Developer                              The world's most advanced
Nuix                                                email data analysis
http://nuix.com/                                and eDiscovery software

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