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From "Peter Keegan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5831) Scale score PostFilter
Date Mon, 17 Mar 2014 22:50:45 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938515#comment-13938515
] 

Peter Keegan commented on SOLR-5831:
------------------------------------

Hi Joel,

Thanks for the reviewing the code. I have a few questions about the issues you found:

1. I've fixed the hashCode() and equals() methods you referred to in your #1. Is this the
same issue as your #3?

2. Do you have any suggestions on how to determine the proper result window size for the QueryResultCache?

3. Are there any unit tests that use randomized testing that I could study for use in this
patch?

Thanks,
Peter

> 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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