[postgis-devel] [PostGIS] #294: Rationalize support for EMPTY

[PostGIS]

#294: Rationalize support for EMPTY
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  Reporter:  pramsey  |       Owner:  pramsey      
      Type:  task     |      Status:  new          
  Priority:  medium   |   Milestone:  PostGIS 2.0.0
 Component:  postgis  |     Version:  trunk        
Resolution:           |    Keywords:  empty        
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Comment (by robe):

 Just itemizing some of these cases as I come across them in tests.

 SELECT  ST_Distance_Sphere(ST_GeomFromText('POLYGON
 EMPTY',4326),ST_GeomFromText('POINT(1 3)',4326))

 Gives error: geometry_distance_spheroid: Only point/line/polygon
 supported.

 Though curiously (which I thought they shared some code)

 SELECT  ST_Distance(geography(ST_GeomFromText('POLYGON
 EMPTY',4326)),geography(ST_GeomFromText('POINT(1 3)',4326)));

 Returns null as expected

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/294#comment:2>
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