[postgis-devel] [PostGIS] #1828: Estimate returned by geography_gist_selectivity results in slow query plan for ST_DWithin

[PostGIS]

#1828: Estimate returned by geography_gist_selectivity results in slow query plan
for ST_DWithin
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 Reporter:  realityexists  |       Owner:  mcayland     
     Type:  defect         |      Status:  new          
 Priority:  medium         |   Milestone:  PostGIS 2.0.2
Component:  postgis        |     Version:  2.0.x        
 Keywords:                 |  
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Comment(by strk):

 Are you saying that ST_AsText(ST_Expand('POINT(0 0)'::geography)) would
 return 'POINT(0 0)' ? If that's the case I'd consider it a bad bug indeed.

 That said, wouldn't it be faster just to always use the cached bbox rather
 than recomputing it ? Or is there any special need to recompute for
 geography ? Or is it the old double vs. float story ?

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1828#comment:25>
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