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https://issues.apache.org/jira/browse/SOLR-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777676#action_12777676
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Grant Ingersoll commented on SOLR-1302:
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I've got Haversine implemented (great circle), and RadianFunction (convert a
val to radians). I'll put up a patch shortly.
> Fun with Distances - Add Distance functions for a variety of things
> -------------------------------------------------------------------
>
> Key: SOLR-1302
> URL: https://issues.apache.org/jira/browse/SOLR-1302
> Project: Solr
> Issue Type: New Feature
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 1.5
>
>
> There are many distance functions that are useful to have:
> 1. Great Circle (lat/lon) and other geo distances
> 2. Euclidean (Vector)
> 3. Manhattan (Vector)
> 4. Cosine (Vector)
> For the vector ones, the idea is that the fields on a document can be used to
> determine the vector.
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