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Posted to java-user@lucene.apache.org by Omar Didi <od...@Cyveillance.com> on 2005/02/25 22:19:45 UTC
help with boolean expression
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
Re: help with boolean expression
Posted by Erik Hatcher <er...@ehatchersolutions.com>.
On Feb 25, 2005, at 4:19 PM, Omar Didi wrote:
> 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.
Output the toString() of the returned Query instances to see how
QueryParser interpreted things.
Erik
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Re: help with boolean expression
Posted by Morus Walter <mo...@tanto.de>.
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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