[postgis-tickets] [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 2.2.0
 Component:  topology  |    Version:  2.0.x
Resolution:            |   Keywords:
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Comment (by strk):

 I'm looking at this case. It seems that code exist which is meant to
 handle this case (of an edge self-collapsing due to snapping) but it's
 evidently uneffective. The problem is that it calls ST_MakeValid which
 only does something if the input is invalid, which is never the case for
 linestrings. We need code that fixes non-simplicity instead

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/1855#comment:17>
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