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 <[email protected]> > 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 <[email protected]> > > > On Wed, Apr 8, 2009 at 11:45 AM, addman <[email protected]> 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/[email protected]/msg07703.html > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > > > > > -- > 王巍巍(Weiwei Wang) > Department of Computer Science > Gulou Campus of Nanjing University > Nanjing, P.R.China, 210093 > > Mobile: 86-13913310569 > MSN: [email protected] > Homepage: http://cs.nju.edu.cn/rl/weiweiwang >
