Peter Keegan created SOLR-5831:
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Summary: 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
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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