See below... On 5/5/07, Daniel Einspanjer <[EMAIL PROTECTED]> wrote:
The query syntax reference page talks about the NOT and the - operators, but it wasn't clear to me what exactly the difference is between them. Could someone tell me briefly what that difference might be or point me at some further docs that describe it?
See the thread "Standard Parser Behavior". It has several explications of what the Lucene query syntax is all about. This confuses everybody, so I think that thread will help you a lot. Also, see http://wiki.apache.org/lucene-java/BooleanQuerySyntax Is there a way to require a portion of a query only if there are values for
that field in the document? e.g. If I know that I only want to match movies made between 1973 and 1975, I would like to be able to say in my query that if the document has a year, it must be in that range, but if the document has no year at all, don't fail the document for that reason alone. This is also important in the director name part. If a document has a director given, and it doesn't match what I'm searching for, that should be a fail, but if the document has no director field, I don't want to fail the document for that reason alone.
You'll have to include a dummy value I think. Remember that you're searching for stuff with Lucene, so saying "match even if there's nothing there" is, er, ABnormal.. I'd think about putting a dummy value in those fields you want to handle this way. For instance, add "matchall" to documents with no date. Then you'd need to add an 'or date:matchall' clause to all the dates you query on. Make sure it's a value that behaves reasonably when you want to include all dates, or all dates before ####, or all dates after ####. Best Erick
Thanks, Daniel
