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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SOLR-5831) Scale score PostFilter
Date Mon, 05 May 2014 13:51:16 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989491#comment-13989491
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Joel Bernstein edited comment on SOLR-5831 at 5/5/14 1:50 PM:
--------------------------------------------------------------

Chris,

I haven't had a chance to review the patch you're working on closely. I did see that it makes
some changes in the lucene core library. One of the nice things about the approach in this
ticket is that it accomplishes score scaling without making any changes to Solr or lucene's
core libraries. In my last post I mention using the a pluggable Collector rather then a PostFilter
in conjuction with SOLR-5973. Using the collector seems to be very fast and scale very well.

Joel 


was (Author: joel.bernstein):
Chris,

I haven't had a chance to review the patch you're working on closely. I did see that it makes
some changes in the lucene core library. One of the nice things about the approach in this
ticket is that it accomplishes scale scoring without making any changes to Solr or lucene's
core libraries. In my last post I mention using the a pluggable Collector rather then a PostFilter
in conjuction with SOLR-5973. Using the collector seems to be very fast and scale very well.

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
>            Assignee: Joel Bernstein
>            Priority: Minor
>             Fix For: 4.9
>
>         Attachments: SOLR-5831.patch, SOLR-5831.patch, SOLR-5831.patch, SOLR-5831.patch,
TestScaleScoreQParserPlugin.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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