Maybe this will answer your question
http://wiki.apache.org/solr/FAQ
Why does 'foo AND -baz' match docs, but 'foo AND (-bar)' doesn't ?
Boolean queries must have at least one "positive" expression (ie; MUST or
SHOULD) in order to match. Solr tries to help with this, and if asked to
execute a BooleanQuery that does contains only negatived clauses _at the
topmost level_, it adds a match all docs query (ie: *:*)
If the top level BoolenQuery contains somewhere inside of it a nested
BooleanQuery which contains only negated clauses, that nested query will not
be modified, and it (by definition) an't match any documents -- if it is
required, that means the outer query will not match.
More Detail:
* https://issues.apache.org/jira/browse/SOLR-80
*
https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201006.mbox/%3Cal
pine.deb.1.10.1006011609080.29...@radix.cryptio.net%3E
Patrick.
-----Original Message-----
From: Chris Hostetter [mailto:hossman_luc...@fucit.org]
Sent: Monday, September 12, 2011 3:04 PM
To: solr-user@lucene.apache.org
Subject: Re: Weird behaviors with not operators.
: I'm crashing into a weird behavior with - operators.
I went ahead and added a FAQ on this using some text from a previous nearly
identical email ...
https://wiki.apache.org/solr/FAQ#Why_does_.27foo_AND_-baz.27_match_docs.2C_b
ut_.27foo_AND_.28-bar.29.27_doesn.27t_.3F
please reply if you have followup questions.
-Hoss
