[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 pramsey):

 I don't think your second _st_expand(col, distance) example makes sense,
 since the expanded version is not necessarily the extent of the whole
 column, it's the extent of the things that pass the other filters in the
 query.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1828#comment:41>
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