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https://issues.apache.org/jira/browse/SOLR-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092490#comment-17092490
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David Smiley commented on SOLR-1302:
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Notice: This (old) issue introduced {{ghhsin()}} and {{geohash()}} function
queries (ValueSources). I'm inclined to delete these for 9.x because it's not
clear to me they have much value now (or if they ever did?). They could be
distracting to users ("oh do I need this; maybe not") and I'd rather us not
continue to maintain what isn't useful. Likewise, I deprecated GeohashField
(and un-documented it) a few years ago and am removing it for 9.x.
> 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, 3.1, 4.0-ALPHA
>
> 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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