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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33019] - [PATCH] BooleanScorer can score documents in non increasing order
Date Wed, 19 Jan 2005 20:12:29 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33019





------- Additional Comments From paul.elschot@xs4all.nl  2005-01-19 21:12 -------
For this to work correctly the list of valid buckets should 
always be sorted, ie. it is necessary to uncomment the sorting 
call in added in next(). 
Otherwise next() might return a higher document 
number than skipTo() would skip to, ie. a lower document number 
would not be scored at all. 
In that case the implementation of skipTo can also be simplified 
somewhat because it would only have to delete from the beginning 
of the valid bucket list. 
 
I think a version of BooleanScorer modified with this patch could 
be used as a BooleanSubScorer. 
As a top level scorer, BooleanScorer is difficult to beat in performance 
for non required clauses, and on the top level it is not a problem that 
documents are not processed strictly in order, normally they will be used 
in a Hits that presents them in another other anyway. 
 
For a non top level scorer, or when the document order should be 
followed strictly, the patched version could be used 
as BooleanSubScorer, or the DisjunctionScorer posted earlier 
could be used. Below top level, DisjunctionScorer could be 
faster because it never works ahead into a bucket list. 
 
A strict document order would also be an advantage when creating an 
IterFilter from a BooleanQuery. 
 
Regards, 
Paul Elschot 
 

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