Hi,
I am adding Apache Lucene support for Querydsl
http://source.mysema.com/display/querydsl/Querydsl (which offers
type-safe queries for Java) and I am having problems understanding how
Lucene evaluates queries especially regarding negation in nested queries.
For instance the following two queries in my opinion are semantically
the same, but only the first one returns results.
+year:1990 -title:"Jurassic Park"
+year:1990 +(-title:"Jurassic Park")
The simplified object tree in the second example is shown below.
query : Query
clauses : ArrayList
[0] : BooleanClause
"MUST" occur : BooleanClause.Occur
"year:1990" query : TermQuery
[1] : BooleanClause
"MUST" occur : BooleanClause.Occur
query : BooleanQuery
clauses : ArrayList
[0] : BooleanClause
"MUST_NOT" occur : BooleanClause.Occur
"title:"Jurassic Park"" query : TermQuery
Lucene's own QueryParser seems to evaluate "AND (NOT" into the same kind
of object trees.
Is this a bug in Lucene or have I misunderstood Lucene's query
evaluation? I am happy to give more information if necessary.
Best regards,
Vesa Marttila
--
Vesa Marttila <[email protected]>
Mysema Ltd, Vilhonkatu 5 A, 00100 Helsinki, Finland
Internet: http://www.mysema.com
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