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https://issues.apache.org/jira/browse/SOLR-12273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453342#comment-16453342
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ASF subversion and git services commented on SOLR-12273:
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Commit bea6f421058a59a2a52217845704625aa8ed6fe9 in lucene-solr's branch 
refs/heads/master from [~joel.bernstein]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=bea6f42 ]

SOLR-12273: Create Stream Evaluators for distance measures


> Create Stream Evaluators for distance measures
> ----------------------------------------------
>
>                 Key: SOLR-12273
>                 URL: https://issues.apache.org/jira/browse/SOLR-12273
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Major
>             Fix For: 7.4
>
>         Attachments: SOLR-12273.patch
>
>
> Currently distance measures are instantiated by passing the name of the 
> distance measure to a function, for example the *knn* function can be passed 
> the named parameter: distance="manhattan". 
> This ticket will create a specific function for each distance measure which 
> will be used to specify which distance measure to apply. With this design the 
> *knn* function would be passed the function: manhattan() or any of the other 
> distance measure functions.
> Sample syntax:
> {code:java}
> knn(a, b, manhattan())
> or
> dbscan(a, haversineMeters()){code}
>  
>  



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