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From Erick Erickson <erickerick...@gmail.com>
Subject Re: Query any data
Date Thu, 09 Apr 2009 17:09:41 GMT
searching for fieldname:* will be *extremely* expensive as it will, by
default,
build a giant OR clause consisting of every term in the field. You'll throw
MaxClauses exceptions right and left. I'd follow Tim's thread lead first....

Best
Erick

2009/4/8 王巍巍 <ww.wang.cs@gmail.com>

> first you should change your querypaser to accept wildcard query by calling
> method of QueryParser
>          setAllowLeadingWildcard
> then you can query like this:  fieldname:*
>
> 2009/4/9 Tim Williams <williamstw@gmail.com>
>
> > On Wed, Apr 8, 2009 at 11:45 AM, addman <addiekong@yahoo.com> wrote:
> > >
> > > Hi,
> > >   Is it possible to create a query to search a field for any value?  I
> > just
> > > need to know if the optional field contain any data at all.
> >
> > google for:  lucene field existence
> >
> > There's no way built in, one strategy[1] is to have a 'meta field'
> > that contains the names of the fields the document contains.
> >
> > --tim
> >
> > [1] -
> > http://www.mail-archive.com/lucene-user@jakarta.apache.org/msg07703.html
> >
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>
>
> --
> 王巍巍(Weiwei Wang)
> Department of Computer Science
> Gulou Campus of Nanjing University
> Nanjing, P.R.China, 210093
>
> Mobile: 86-13913310569
> MSN: ww.wang.cs@gmail.com
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