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https://issues.apache.org/jira/browse/LUCENE-7103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-7103:
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Attachment: LUCENE-7103.patch
simple patch. We "do the rest" of the haversin calculation only when we need
the final value: value() and compareTop().
> further optimize LatLonPoint.newDistanceSort
> --------------------------------------------
>
> Key: LUCENE-7103
> URL: https://issues.apache.org/jira/browse/LUCENE-7103
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Attachments: LUCENE-7103.patch
>
>
> This comparator creates bounding boxes to avoid calling haversin(), so its no
> longer a hotspot for most use cases.
> But in the worst case, it could still get called many times. This could be
> because the user had a massive top N value, or because the incoming data is
> sorted or mostly sorted by decreasing distance, etc.
> We can optimize the worst case by not invoking a full haversin, just using
> something that is rank-equivalent.
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