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Jun 1, 2005, 9:31 AM
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DO NOT REPLY [Bug 35157] New: - Inconsistent scoring with SpanTermQuery in BooleanQuery
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http://issues.apache.org/bugzilla/show_bug.cgi?id=35157
Summary: Inconsistent scoring with SpanTermQuery in BooleanQuery
Product: Lucene
Version: CVS Nightly - Specify date in submission
Platform: Other
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Search
AssignedTo: lucene-dev [at] jakarta
ReportedBy: yahootintin-lucene [at] yahoo
When a SpanTermQuery is added to a BooleanQuery, incorrect results are
returned.
I am running Lucene 1.9 RC1 on Windows XP. I have a test case which has
several tests. It has an index with 4 identical documents in it.
When two TermQuerys are used in a BooleanQuery, the score looks like this:
4 hits for search: two term queries
ID:1 (score:0.54932046)
ID:2 (score:0.54932046)
ID:3 (score:0.54932046)
ID:4 (score:0.54932046)
Notice how it is correctly setting the score to be the same for each document.
When two SpanQuerys are used in a BooleanQuery, the score looks like this:
2 hits for search: two span queries
ID:1 (score:0.3884282)
ID:4 (score:0.1942141)
Notice how it only returned two documents instead of four. And the two it did
return have differing scores.
I believe that there is an error in the scoring algorithm that is making the
other two documents not show up.
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