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Message-ID: <4A799EC7.5080302@gmail.com>
Date: Wed, 05 Aug 2009 11:01:27 -0400
From: Mark Miller <markrmiller@gmail.com>
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To: java-dev@lucene.apache.org
Subject: Re: SpanQuery and BoostingTermQuery oddities
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 <222250B0-DC0F-47A2-A515-3C7A77CE0B73@apache.org>
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Grant Ingersoll wrote:
>
> On Aug 5, 2009, at 10:07 AM, Mark Miller wrote:
>> Yeah - SpanQuery's don't use the boosts from subspans - it just uses 
>> the idf for the query terms and the span length I believe - and the 
>> boost for the top level Query.
>>
>> Is that the right way to go? I guess Doug seemed to think so? I don't 
>> know. It is sort of a bug that lower boosts would be ignored right? 
>> There is an issue for it somewhere.
>>
>> It gets complicated quick to change it - all of a sudden you need 
>> something like BooleanQuery ...
>>
>
> Not sure it needs BooleanQuery, but it does seem like it should take 
> into account the scores of the subclauses (regardless of 
> BoostingTermQuery).  There is a spot in creating the SpanScorer where 
> it gets the value from the QueryWeight, but this QueryWeight does not 
> account for the subclauses QueryWeights.
>

It doesn't need BooleanQuery - it needs BooleanQuery type logic - which 
is fairly complicated. At least to do it right I think. I don't have a 
clear memory of it, but I started to try and address this once and ...
well I didn't continue.

-- 
- Mark

http://www.lucidimagination.com


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