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https://issues.apache.org/jira/browse/SOLR-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989704#comment-13989704
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Peter Keegan commented on SOLR-5831:
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Hi Joel,
I'll work on adding some multi-segment unit tests soon.
I haven't looked closely at SOLR-5973 yet, so I don't know how much effort it
will be to change the score scaling collector from the old framework to the
new. In the old framework, the plugin extends TopDocsCollector and overrides
'topDocs' to change the ordering, and is not particularly generic. I'll take a
look, though.
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
> 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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