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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-4342) Issues with prefix tree's Distance Error Percentage
Date Fri, 31 Aug 2012 17:55:10 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Smiley resolved LUCENE-4342.
----------------------------------

    Resolution: Fixed

Committed to 4x (r1379531) and trunk (r1379530)
                
> Issues with prefix tree's Distance Error Percentage 
> ----------------------------------------------------
>
>                 Key: LUCENE-4342
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4342
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/spatial
>    Affects Versions: 4.0-ALPHA, 4.0-BETA
>            Reporter: Itamar Syn-Hershko
>            Assignee: David Smiley
>             Fix For: 4.0
>
>         Attachments: LUCENE-4342_fix_distance_precision_lookup_for_prefix_trees,_and_modify_the_default_algorit.patch,
unnamed.patch
>
>
> See attached patch for a failing test
> Basically, it's a simple point and radius scenario that works great as long as args.setDistPrecision(0.0);
is called. Once the default precision is used (2.5%), it doesn't work as expected.
> The distance between the 2 points in the patch is 35.75 KM. Taking into account the 2.5%
error the effective radius without false negatives/positives should be around 34.8 KM. This
test fails with a radius of 33 KM.

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