renaud.waldura at library
Jul 30, 2007, 10:38 AM
Post #2 of 2
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Yeah, it's a surprise, isn't it? I'm afraid there isn't a good answer.
http://wiki.apache.org/lucene-java/BooleanQuerySyntax
The "best practice" appears to be to require parens everywhere to force the
evaluation order. Not very satisfying, but it does work 100%.
-----Original Message-----
From: Sonu SR [mailto:sonusr[at]gmail.com]
Sent: Monday, July 30, 2007 8:49 AM
To: java-user[at]lucene.apache.org
Subject: Question regarding boolean query
Hi,
I am getting different results for the following queries.
1. ABST:"spring-elastic"^3 AND SPEC:"internal combustion"^2 OR
ABST:"cylinder"^3
2. SPEC:"internal combustion"^2 AND ABST:"spring-elastic"^3 OR
ABST:"cylinder"^3
I think the above two queries are similar and will give the same results.
I want to know the order of boolean operators. Is there any grouping is
applied when fields repeats in the query?
By applying the queries to lucene QueryParser, I got the results as
1. +ABST:"spring elastic"^3.0 SPEC:"internal
combustion"^2.0ABST:cylinder^ 3.0
2. +SPEC:"internal combustion"^2.0 ABST:"spring
elastic"^3.0ABST:cylinder^ 3.0
I have set the QueryParser operator as 'AND'. I was confused by looking on
the QueryParser output.
Please give me a good explanation, how lucene handling the boolean queries.
Thanks,
Sonu
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