Lucene's nested query evaluation regarding negation

Posted by ponzao on Stack Overflow See other posts from Stack Overflow or by ponzao
Published on 2010-03-18T10:46:58Z Indexed on 2010/03/18 10:51 UTC
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lucene

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java

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type-safety

Hi,

I am adding Apache Lucene support to 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.

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