[postgis-tickets] [PostGIS] #4757: ERROR: Invalid edge (no two distinct vertices exist)

[PostGIS]

#4757: ERROR:  Invalid edge (no two distinct vertices exist)
----------------------+---------------------------
 Reporter:  strk      |      Owner:  strk
     Type:  defect    |     Status:  new
 Priority:  medium    |  Milestone:  PostGIS 3.1.0
Component:  topology  |    Version:  master
 Keywords:            |
----------------------+---------------------------
 The following snippet results in an exception:

 {{{
 select createtopology ('tt', 0);
 select topogeo_addpoint('tt', 'POINT(0 0)');
 select topogeo_addlinestring('tt', 'LINESTRING(0 -0.1,1 0,1 1,0 1,0
 -0.1)'::geometry, 1);
 }}}

 Exception is:
 ERROR:  Invalid edge (no two distinct vertices exist)


 This probably happens also in PostGIS-2.4

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4757>
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