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List:       lucene-user
Subject:    Re: help with boolean expression
From:       Morus Walter <morus.walter () tanto ! de>
Date:       2005-02-28 7:40:23
Message-ID: 16930.51943.928083.182503 () tanto-xipolis ! de
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Omar Didi writes:
> I have a problem understanding how would lucene iterpret this boolean expression : A AND B OR C .
> it neither return the same count as when I enter (A AND B) OR C nor A AND (B OR C). 
> if anyone knows how it is interpreted i would be thankful.
> thanks

A AND B OR C creates a query that requires A and B. C influcenes the 
score, but is neither sufficient nor required for a match.

IMO query parser is broken for queries mixing AND and OR without explicit
braces.
My favorite sample is `a AND b OR c AND d' which equals `a AND b AND c AND d'
in query parser.

I suggested a patch some time ago, but it's still pending in bugzilla.
http://issues.apache.org/bugzilla/show_bug.cgi?id=25820

Don't know if it's still usable with current sources.

Morus

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