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From Mark Miller <markrmil...@gmail.com>
Subject Re: PhraseQuery issues - differences with SpanNearQuery
Date Fri, 05 Sep 2008 14:57:34 GMT
Paul Elschot wrote:
> Op Thursday 04 September 2008 20:39:13 schreef Mark Miller:
>   
>> Sounds like its more in line with what you are looking for. If I
>> remember correctly, the phrase query factors in the edit distance in
>> scoring, but the NearSpanQuery will just use the combined idf for
>> each of the terms in it, so distance shouldnt matter with spans (I'm
>> sure Paul will correct me if I am wrong).
>>     
>
> SpanScorer will use the similarity slop factor for each matching
> span size to adjust the effective frequency.
> The span size is the difference in position between the first
> and last matching term, and idf is not used for scoring Spans.
> The reason why idf is not used could be that there is no basic
> score value associated with inner spans; only top level spans
> are scored by SpanScorer.
> For more details, please consult the SpanScorer code.
>
> Regards,
> Paul Elschot
>   
Right, my fault, its the query normalization in the weight which uses 
idf (by pulling from each clause in the span). So its kind of factored 
into the score, but not in the way I implied. Sorry, my bad on the info.

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