Uh, I'm not sure if this is in the Lucene FAQ, but it ought to be. The "+" means that the term/clause MUST be in a document if a document is to be counted as a match. The "-" means that the term/clause MUST NOT be in a document if a document is to be counted as a match.
Is this even syntactically correct: field1:(-value1) vs. -field1:value1 I suppose it is if you the QueryParser is not blowing up... Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch ----- Original Message ---- > From: Lyman Hurd <[EMAIL PROTECTED]> > To: "solr-user@lucene.apache.org" <'solr-user@lucene.apache.org'> > Sent: Thursday, August 28, 2008 3:06:52 PM > Subject: question about + and - in field queries > > We are trying to use the "+" (mandatory) and "- "(forbidden) modifiers > in field queries but we do not seem to be getting what we expected. > > > > Specifically our query is: > > > > field1:(-value1) field2:value2 > > > > as an alternative we tried: > > > > -field1:value1 field2:value2 > > > > which appears to behave as if the two conditions were separated by > "and". > > > > There would seem to be two logical alternatives. One would be that it > would return all results that satisfied both halves (an implicit AND), > and the other that it returns results satisfying at least one (implicit > OR). We have verified that the search behavior does not change if one > replaces the space between the terms with an explicit OR which is > consistent with the default. However, what is being returned is simply > those entried satisfying the second condition (all the returns happen to > violate the first) and no results are returned that satisfy the first > but not the second. > > > > Another query: > > > > field1:(+value1) field2:value2 > > > > is giving precisely the same results as: > > > > field1:value1 field2:value2 > > > > instead of giving only results which satisfy the first condition. > > > > Can someone give a concise explanation of exactly how "+" and "-" > interact when used across fields. I am not able to reconcile the > behavior with the description in the Lucene syntax documentation. > > > > Thanks, > > > > Lyman > > Lyman Hurd > Sr. Principal Engineer > Interwoven, Inc. > 404.264.8068 > [EMAIL PROTECTED] > Visit www.interwoven.com > The Next-Generation Enterprise Content Management Company
