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https://issues.apache.org/jira/browse/SOLR-12273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16513442#comment-16513442
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Adrien Grand commented on SOLR-12273:
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[~joel.bernstein] Should we resolve this issue?
> 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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