Solr/Lucene does not implement strict boolean logic. Here's an excellent blog discussing this:
http://searchhub.org/dev/2011/12/28/why-not-and-or-and-not/ Best Erick On Tue, Jan 22, 2013 at 7:25 PM, Otis Gospodnetic <otis.gospodne...@gmail.com> wrote: > Well, depends on what you indexed. > > Otis > Solr & ElasticSearch Support > http://sematext.com/ > On Jan 22, 2013 5:48 PM, "Anders Melchiorsen" <m...@spoon.kalibalik.dk> > wrote: > >> Thanks, though I am still confused. >> >> How about this one: >> >> manu:apple => 1 hit >> +name:video => 2 hits >> >> manu:apple +name:video => 2 hits >> >> Solr ignores the manu:apple part completely? >> >> >> Cheers, >> Anders. >> >> >> Den 22/01/13 23.16, Jack Krupansky skrev: >> >>> The first query: >>> >>> name:ipod OR -name:ipod => 0 hits >>> >>> The "OR" and "-" are actually at the same level of the BooleanQuery, so >>> the "-" overrides the OR so it's equivalent to: >>> >>> name:ipod -name:ipod => 0 hits >>> >>> For the second query: >>> >>> (name:ipod) OR (-name:ipod) => 3 hits >>> >>> Pure negative queries are supported only at the top level, so the >>> "(-name:ipod)" matches nothing, so the query is equivalent to: >>> >>> (name:ipod) => 3 hits >>> >>> You can simply insert a "*:*" to assure that it is not a pure negative >>> query inside the parentheses: >>> >>> (name:ipod) OR (*:* -name:ipod) >>> >>> -- Jack Krupansky >>> >>> -----Original Message----- From: Anders Melchiorsen >>> Sent: Tuesday, January 22, 2013 4:59 PM >>> To: solr-user@lucene.apache.org >>> Subject: Confused by queries >>> >>> Hello! >>> >>> With the example server of Solr 4.0.0 (with *.xml indexed), I get these >>> results: >>> >>> *:* => 32 hits >>> name:ipod => 3 hits >>> -name:ipod => 29 hits >>> >>> That is all fine, but for these next queries, I would expect to get 32 >>> hits (i.e. everything), or at least the same number of hits for both >>> queries: >>> >>> name:ipod OR -name:ipod => 0 hits >>> (name:ipod) OR (-name:ipod) => 3 hits >>> >>> As my expectations are not met, I must be missing something? >>> >>> >>> Thanks, >>> Anders. >>> >> >>
