[postgis-tickets] [PostGIS] #4182: Unexpected TopologyException during ST_Union aggregate function with valid polygons

[PostGIS]

#4182: Unexpected TopologyException during ST_Union aggregate function with valid
polygons
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  Reporter:  blaggner  |      Owner:  pramsey
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS GEOS
 Component:  postgis   |    Version:  2.3.x
Resolution:            |   Keywords:
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Changes (by pramsey):

 * milestone:  PostGIS 2.4.7 => PostGIS GEOS


Comment:

 It's cool you could find rows that, when removed, caused the problem to
 stop... it's not surprising that they on their own do not cause the
 problem, because the problem is an interaction effect, probably part-way
 up the tree that union is traversing as it unions objects, and then unions
 those unions, etc, etc. It *might* be possible to make a small set that
 replicates the error, by adding into your extraction the features in the
 general area of the problematic features you found. Maybe. It's also
 possible the error happens far enough up the tree that a much larger chunk
 of data is needed to replicate it. I'm moving this over to PostGIS GEOS
 milestone and hoping that with GEOS 3.8 we'll have robust overlay and all
 these go away.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4182#comment:4>
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