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From Smith G <gudumba.sm...@gmail.com>
Subject question regarding BooleanQuery:equals() method
Date Thu, 11 Feb 2010 14:51:15 GMT
Hello All,
            I am writing some test cases for a custom-class which
modifies incoming TermQuery and adds some other Terms and returns a
BooleanQuery. As always I have used assertEquals(), which apparently
uses equals() method. I found out that following two queries are
different from each other if we use BooleanQuery.equals() if the
positions of the terms are inconsistent.

For Ex :

1) BooleanQuery bq1 = new BooleanQuery();

    bq1.add(new TermQuery(new Term("fiedl_1", "value_1")),
BooleanClause.Occur.MUST);

    bq1.add(new TermQuery(new Term("fiedl_2", "value_2")),
BooleanClause.Occur.MUST_NOT);


2) BooleanQuery bq2 = new BooleanQuery();

    bq2.add(new TermQuery(new Term("fiedl_2", "value_2")),
BooleanClause.Occur.MUST_NOT);

    bq2.add(new TermQuery(new Term("fiedl_1", "value_1")),
BooleanClause.Occur.MUST);


3) BooleanQuery bq3 = new BooleanQuery();

    bq3.add(new TermQuery(new Term("fiedl_1", "value_1")),
BooleanClause.Occur.MUST);

    bq3.add(new TermQuery(new Term("fiedl_2", "value_2")),
BooleanClause.Occur.MUST_NOT);

I have observed following...
 A)  bq1.equals(bq2) returns FALSE;
 B)  bq1.equals(bq3) returns  TRUE

     The issue is that we never know the order of terms populated in
the retunred BooleanQuery by the method. As according to the method
queries are not equal if the term's position changes, i.e I can not
prepare expected result.   So I would be glad to know the point here?
"Are they really different?". If yes, Can you suggest me an
alternative which is conventionally used to test this kind of cases.

(NOTE :: If you find any inconsistency in the field values (spellings,
etc) or in the code, Just assume that they are typing mistakes.)
Thanks.

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