Re: about boosting queries...

[Chris Hostetter <ho...@fucit.org>]

Marc: I know it's been a while since you asked this question, but i didn't 
see any reply ... in general the problem is that a "low" boost is stil la 
boost, it can only improve the score of documents that match.

one way to fake a "negative boost" is to give a high boost to everything 
that does *not* match.  This should do what you want...

	bq=(*:* -field_a:54^10000)

...I can't remember if "bq" supports pure negative queries yet, if it does 
then you can simplify that to bq=-field_a:54^10000


On Mon, 11 May 2009, Marc Sturlese wrote:

: Hey there,
: I would like to give very low boost to the docs that match field_a = 54.
: I have tried
: 
: <str name="bq">field_a:54^0.00001</str>
: 
: but it's not working. In the opposite case, I mean to give hight boost
: doing:
: 
: <str name="bq">field_a:54^10000</str>
: 
: it works perfect. I supose it is because I do the search in 6 fields and a 	
: summation is happening so.. even if I am seting boost to 0.00001 the sum
: with other fields boost makes the bq to almost not take effect (and negative
: boost is not allowed). Is that the reason? Any clue how could I reach my
: goal?
: 
: Thanks in advance
: -- 
: View this message in context: http://www.nabble.com/about-boosting-queries...-tp23484208p23484208.html
: Sent from the Solr - User mailing list archive at Nabble.com.
: 



-Hoss

Re: about boosting queries...

[Shalin Shekhar Mangar <sh...@gmail.com>]

On Fri, Jun 19, 2009 at 7:00 AM, Chris Hostetter
<ho...@fucit.org>wrote:

>
> Marc: I know it's been a while since you asked this question, but i didn't
> see any reply ... in general the problem is that a "low" boost is stil la
> boost, it can only improve the score of documents that match.
>
> one way to fake a "negative boost" is to give a high boost to everything
> that does *not* match.  This should do what you want...
>
>        bq=(*:* -field_a:54^10000)
>
> ...I can't remember if "bq" supports pure negative queries yet, if it does
> then you can simplify that to bq=-field_a:54^10000
>

Thanks for the info Hoss.

I've added it to http://wiki.apache.org/solr/SolrRelevancyFAQ

-- 
Regards,
Shalin Shekhar Mangar.

Re: about boosting queries...

[Marc Sturlese <ma...@gmail.com>]

Thanks! Even a bit late but it's really useful information!!


hossman wrote:
> 
> 
> Marc: I know it's been a while since you asked this question, but i didn't 
> see any reply ... in general the problem is that a "low" boost is stil la 
> boost, it can only improve the score of documents that match.
> 
> one way to fake a "negative boost" is to give a high boost to everything 
> that does *not* match.  This should do what you want...
> 
> 	bq=(*:* -field_a:54^10000)
> 
> ...I can't remember if "bq" supports pure negative queries yet, if it does 
> then you can simplify that to bq=-field_a:54^10000
> 
> 
> On Mon, 11 May 2009, Marc Sturlese wrote:
> 
> : Hey there,
> : I would like to give very low boost to the docs that match field_a = 54.
> : I have tried
> : 
> : <str name="bq">field_a:54^0.00001</str>
> : 
> : but it's not working. In the opposite case, I mean to give hight boost
> : doing:
> : 
> : <str name="bq">field_a:54^10000</str>
> : 
> : it works perfect. I supose it is because I do the search in 6 fields and
> a 	
> : summation is happening so.. even if I am seting boost to 0.00001 the sum
> : with other fields boost makes the bq to almost not take effect (and
> negative
> : boost is not allowed). Is that the reason? Any clue how could I reach my
> : goal?
> : 
> : Thanks in advance
> : -- 
> : View this message in context:
> http://www.nabble.com/about-boosting-queries...-tp23484208p23484208.html
> : Sent from the Solr - User mailing list archive at Nabble.com.
> : 
> 
> 
> 
> -Hoss
> 
> 
> 

-- 
View this message in context: http://www.nabble.com/about-boosting-queries...-tp23484208p24108953.html
Sent from the Solr - User mailing list archive at Nabble.com.