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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 32674] - MultiFieldQueryParser and BooleanQuery do not provide adequate support for queries across multiple fields
Date Mon, 13 Dec 2004 22:51:24 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32674





------- Additional Comments From chuck@manawiz.com  2004-12-13 23:51 -------
Oops, forgot I use Java 1.5 and forgot I had improved this class by taking
advatnage of it.  I don't believe the original version of MaxDisjunctionQuery
that I sent in email sometime ago had this issue, but it seems moot nonetheless
as Paul Elschot's DisjunctionQuery is going into Lucene and can be used to get
the same effect.  This can be done easily if it is factored such that
DisjunctionQuery provides a general mechanism for subclasses to initialize
state, update state, and produce the final score as it combines the subscorers,
while DisjunctionSumQuery overrides this to implement an optimized version that
doesn't require the method calls.

So my recommendation, would be to factor DisjunctionQuery to make overriding for
different combining operators easy and to include a version of
DisjunctionMaxQuery that uses this to implement the MaxDisjunctionQuery scoring
semantics (i.e., combining operator = max plus constant times sum of other
terms).  I'd be happy to write that version of DisjunctionMaxQuery once
DisjunctionQuery comes out in a released version of Lucene if it's not done for
the release.


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