"lucene user", Look at MemoryIndex (in Lucene contrib) for the "alert about new documents that match an interest" part of the problem.
Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch ----- Original Message ---- > From: lucene user <[EMAIL PROTECTED]> > To: java-user@lucene.apache.org > Sent: Thursday, May 22, 2008 5:44:29 AM > Subject: Handeling when a field does not exist in the document > > We have a requirement to inform users on a regular basis of new material on > which they have expressed interest. How are we to know what is "new" from > the point of view of a particular user? Our idea is to tag each new item in > some way (perhaps a date/time stamp in the lucene index indicating when the > new document was indexed) and remember when the last time we sent out an > alert to that user. > How should we tag the documents? With a date/time of indexing stamp? An > incrementing batch import ID number? Does it matter much? > > *I am reminded that ranges of dates and numbers, (as well as wild cards) are > evaluated as if they were a large OR query covering all the values that > exist in the index. Lucene only finds exact matches - it does not do > comparisons. This means that ranges with lots of different values in them > are bad - and can actually crash with a 'too many clauses' exception if > there are enough distinct values to push the number of clauses over 1024. Do > I understand this correctly?* > > *How do we handle existing documents which do not have such a new field > associated with them? Can we provide a default value for the existing > documents? * > > I did not find the place in the Lucene Documentation where it explains what > you get when you try to retrieve or search on a field that does not exist in > the document. I remember it not being a problem, but I couldn't find it. How > do I do this? What should I read? > > Thanks! --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
