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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-736) Sloppy Phrase Scoring Misbehavior
Date Fri, 01 Dec 2006 09:14:21 GMT
Sloppy Phrase Scoring Misbehavior
---------------------------------

                 Key: LUCENE-736
                 URL: http://issues.apache.org/jira/browse/LUCENE-736
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
            Reporter: Doron Cohen
         Assigned To: Doron Cohen
            Priority: Minor


This is an extension of https://issues.apache.org/jira/browse/LUCENE-697

In addition to abnormalities Yonik pointed out in 697, there seem to be other issues with
slopy phrase search and scoring.

1) A phrase with a repeated word would be detected in a document although it is not there.
I.e. document = A B D C E , query = "B C B" would not find this document (as expected), but
query "B C B"~2 would find it. 
I think that no matter how large the slop is, this document should not be a match.

2) A document containing both orders of a query, symmetrically, would score differently for
the queru and for its reveresed form.
I.e. document = A B C B A would score differently for queries "B C"~2 and "C B"~2, although
it is symmetric to both.

I will attach test cases that show both these problems and the one reported by Yonik in 697.


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