[postgis-devel] [PostGIS] #2024: raster: ST_Union is buggy

[PostGIS]

#2024: raster: ST_Union is buggy
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 Reporter:  robe     |       Owner:  dustymugs    
     Type:  defect   |      Status:  new          
 Priority:  blocker  |   Milestone:  PostGIS 2.1.0
Component:  raster   |     Version:  trunk        
 Keywords:           |  
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Comment(by dustymugs):

 I'm not surprised that there are performance issues, especially in tuned
 cases.  And yes, ST_Union goes over every pixel including NODATA.  Still
 have to decide where to make that particular optimization.  In the pg
 C-layer or one step lower in the generic iterator.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2024#comment:15>
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