[postgis-tickets] [PostGIS] #2828: Speed up ST_Envelope

[PostGIS]

#2828: Speed up ST_Envelope
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 Reporter:  strk         |       Owner:  dustymugs
     Type:  enhancement  |      Status:  new      
 Priority:  medium       |   Milestone:           
Component:  raster       |     Version:  2.1.x    
 Keywords:               |  
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 I noticed that ST_Envelope(rast) is implemented as
 ST_Envelope(ST_ConvexHull(rast)).

 I'm not sure if that's necessary.
 Ideally ST_Envelope should be able to give a response by only looking at
 the raster header, without even fully detoasting the raster.

 See #2822

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2828>
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