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https://issues.apache.org/jira/browse/LUCENE-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13789061#comment-13789061
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Ted Dunning commented on LUCENE-5258:
-------------------------------------
It occurs to me that you don't need the final inverse trig function if you only
want to rank distances.
So if you want speed, peel that baby off. Results for comparison at
https://microbenchmarks.appspot.com/runs/43b5e3b9-5d1b-4a6c-9aaf-d4834c82523d
> add distance function to expressions/
> -------------------------------------
>
> Key: LUCENE-5258
> URL: https://issues.apache.org/jira/browse/LUCENE-5258
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/other
> Reporter: Robert Muir
> Fix For: 5.0, 4.6
>
> Attachments: LUCENE-5258.patch
>
>
> Adding this static function makes it really easy to incorporate distance with
> the score or other signals in arbitrary ways, e.g. score / (1 +
> log(distance)) or whatever.
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