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https://issues.apache.org/jira/browse/LUCENE-7215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15240153#comment-15240153
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Michael McCandless commented on LUCENE-7215:
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+1, cool
> don't invoke full haversin for LatLonPoint.newDistanceQuery
> -----------------------------------------------------------
>
> Key: LUCENE-7215
> URL: https://issues.apache.org/jira/browse/LUCENE-7215
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Attachments: LUCENE-7215.patch
>
>
> For tree traversals and edge cases we still sometimes invoke full haversin
> (with asin() call and everything). this is not necessary: we just need to
> compute the exact sort key needed for comparisons.
> While not a huge optimization, its obviously less work and keeps the overhead
> of the BKD traversal as low as possible. And it removes the slow asin call
> from any hot path (its already done for sorting too), with its large tables
> and so on.
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