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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7123) deduplicate/cleanup spatial distance
Date Mon, 21 Mar 2016 15:53:25 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204492#comment-15204492
] 

ASF subversion and git services commented on LUCENE-7123:
---------------------------------------------------------

Commit c49e761c1bac84efa1e92a6a7b0f2169bba2612a in lucene-solr's branch refs/heads/branch_6_0
from [~rcmuir]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=c49e761 ]

LUCENE-7123: deduplicate/cleanup spatial distance


> deduplicate/cleanup spatial distance
> ------------------------------------
>
>                 Key: LUCENE-7123
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7123
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>             Fix For: master, 6.0
>
>         Attachments: LUCENE-7123.patch, LUCENE-7123.patch
>
>
> Currently there is a bit of a mess here: SloppyMath.haversin is slightly different from
GeoDistanceUtils.haversin, the latter is actually slightly faster and uses a simple fixed
earth diameter (which makes calculations easier too).
> But one of these returns meters, the other kilometers. Furthermore lucene/spatial now
uses some sin/tan functions that were added to sloppymath with some accuracy guarantees (which
are untested, and not quite correct). Lucene/spatial queries also inconsistently mix the two
different functions together for various purposes and this just causes headaches. Its tests
did this recently too.
> We need to clean this up, otherwise users will be confused. E.G. they will see different
results from expressions than from queries and not understand.



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