[
https://issues.apache.org/jira/browse/LUCENE-4978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945598#comment-13945598
]
ASF subversion and git services commented on LUCENE-4978:
---------------------------------------------------------
Commit 1581017 from [~dsmiley] in branch 'dev/branches/lucene_solr_4_7'
[ https://svn.apache.org/r1581017 ]
LUCENE-4978: spatial grid false-negatives at edge
> Spatial search with point query won't find identical indexed point
> ------------------------------------------------------------------
>
> Key: LUCENE-4978
> URL: https://issues.apache.org/jira/browse/LUCENE-4978
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial
> Affects Versions: 4.1
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 4.8
>
> Attachments: LUCENE-4978_fix_small_grid_false_negatives.patch
>
>
> Given a document with indexed POINT (10 20), when a search for INTERSECTS(
> POINT (10 20)) is issued, no results are returned.
> The work-around is to not search with a point shape, use a very small-radius
> circle or rectangle. (I'm marking this issue as "minor" because it's easy to
> do this).
> An unstated objective of the PrefixTree/grid approximation is that no matter
> what precision you use, an intersects query will find all true-positives.
> Due to approximations, it may also find some close false-positives. But in
> the case above, that unstated promise is violated. But it can also happen
> for query shapes other than points which do in fact barely enclose the point
> given at index time yet the indexed point is in-effect shifted to the center
> point of a cell which could be outside the query shape, and ultimately
> leading to a false-negative.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: dev-h...@lucene.apache.org
