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https://issues.apache.org/jira/browse/SOLR-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778312#action_12778312
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Grant Ingersoll commented on SOLR-1302:
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That being said, my anecdotal tests show them to be pretty fast over ~68K docs.
I'm going to load up the entire Open Street Map planet at some point this week
and then I can run real tests.
> 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
>
> Attachments: SOLR-1302.patch, SOLR-1302.patch, SOLR-1302.patch
>
>
> 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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