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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7942) For Geo3d paths, aggregating distance values using "+" is not adequate for squared distances
Date Mon, 28 Aug 2017 05:53:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143396#comment-16143396
] 

ASF subversion and git services commented on LUCENE-7942:
---------------------------------------------------------

Commit fe766452132c0260198a9516094278ff84ac55e6 in lucene-solr's branch refs/heads/branch_7x
from [~kwright@metacarta.com]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=fe76645 ]

LUCENE-7942: Add aggregateDistances() method to DistanceStyle, and use it in GeoStandardPath
to aggregate distances from segment to segment.


> 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
>
> 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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