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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5831) Scale score PostFilter
Date Sat, 08 Mar 2014 03:22:44 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924693#comment-13924693
] 

Joel Bernstein commented on SOLR-5831:
--------------------------------------

Peter,

Lot's of good stuff here. It's going to take me some time to fully review it. I'm on vacation
next week but when I get I'll take a close look.  

Joel

> Scale score PostFilter
> ----------------------
>
>                 Key: SOLR-5831
>                 URL: https://issues.apache.org/jira/browse/SOLR-5831
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 4.7
>            Reporter: Peter Keegan
>            Priority: Minor
>         Attachments: SOLR-5831.patch
>
>
> The ScaleScoreQParserPlugin is a PostFilter that performs score scaling.
> This is an alternative to using a function query wrapping a scale() wrapping a query().
For example:
> select?qq={!edismax v='news' qf='title^2 body'}&scaledQ=scale(product(query($qq),1),0,1)&q={!func}sum(product(0.75,$scaledQ),product(0.25,field(myfield)))&fq={!query
v=$qq}
> The problem with this query is that it has to scale every hit. Usually, only the returned
hits need to be scaled,
> but there may be use cases where the number of hits to be scaled is greater than the
returned hit count,
> but less than or equal to the total hit count.
> Sample syntax:
> fq={!scalescore+l=0.0 u=1.0 maxscalehits=10000 func=sum(product(sscore(),0.75),product(field(myfield),0.25))}
> l=0.0 u=1.0 		//Scale scores to values between 0-1, inclusive 
> maxscalehits=10000 	//The maximum number of result scores to scale (-1 = all hits, 0
= results 'page' size)
> func=... 			//Apply the composite function to each hit. The scaled score value is accessed
by the 'score()' value source
> All parameters are optional. The defaults are:
> l=0.0 u=1.0
> maxscalehits=0 (result window size)
> func=(null)
>  
> Note: this patch is not complete, as it contains no test cases and may not conform 
> to all the guidelines in http://wiki.apache.org/solr/HowToContribute. 
>  
> I would appreciate any feedback on the usability and implementation.



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