[postgis-devel] [PostGIS] #1855: 'SQL/MM Spatial exception - curve not simple' exception at adding two polygons

[PostGIS]

#1855: 'SQL/MM Spatial exception - curve not simple' exception at adding two
polygons
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 Reporter:  wimned    |       Owner:  strk         
     Type:  defect    |      Status:  assigned     
 Priority:  medium    |   Milestone:  PostGIS 2.0.1
Component:  topology  |     Version:  2.0.x        
 Keywords:            |  
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Comment(by strk):

 so, after fixing the simplicity of the line next problem is that this
 cleanup operation changes first and last point, so that you can't call
 ST_AddEdgeModFace relying on the previously added start/endpoints. In the
 above scenario the cleanup to (0 0, 10 0) will introduce a new node (10 0)
 which wasn't known before cleaning up. Sounds like a possibly iterative
 process in that we could still add (10 0) as the new endpoint but then
 would need to re-snap possibly introducing more troubles.

 As seen in many other cases, a predictable snapping strategy would greatly
 help all of this.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/1855#comment:8>
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