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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-7942) For Geo3d paths, aggregating distance values using "+" is not adequate for squared distances
Date Mon, 28 Aug 2017 05:57:00 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-7942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karl Wright resolved LUCENE-7942.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 7.1
                   master (8.0)
                   6.7

> For Geo3d paths, aggregating distance values using "+" is not adequate for squared distances
> --------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-7942
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7942
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/spatial3d
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>             Fix For: 6.7, master (8.0), 7.1
>
>
> The GeoStandardPath object aggregates distances segment by segment using simple addition.
 For some kinds of Distance computations, though, addition is not an adequate way to do this.
 The xxxSquaredDistance computations, for example, do not produce true squared distances but
rather a distance metric that is a combination of both squared and linear.
> I propose adding support in Distance for aggregation, which would allow distance calculators
to compute an accurate distance (at some computational cost) instead.



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