[postgis-tickets] [PostGIS] #3401: ST_ModEdgeSplit makes topology invalid

[PostGIS]

#3401: ST_ModEdgeSplit makes topology invalid
----------------------+---------------------------
 Reporter:  strk      |      Owner:  strk
     Type:  defect    |     Status:  new
 Priority:  medium    |  Milestone:  PostGIS 2.2.1
Component:  topology  |    Version:  trunk
 Keywords:            |
----------------------+---------------------------
 It has been reported by Alessandro Furieri (esseffe) that the following
 snippet creates an invalid topology on a 32bit Windows machine.

 It has to be tested for confirmation on both windows and other 32bit
 systems.

 The snippet:
 {{{
 SELECT CreateTopology('topotest', 0, 0, 0);
 SELECT ST_AddIsoNode('topotest', 0, ST_MakePoint(-180, 0));
 SELECT ST_AddIsoNode('topotest', 0, ST_MakePoint(0, 0));
 SELECT ST_AddIsoEdge('topotest', 1, 2, 'LINESTRING(-180 0, 0
 0)'::geometry);
 SELECT ST_ModEdgeSplit('topotest', 1, MakePoint(-20, 0));
 }}}

 In order to test topology validity:
 {{{
 SELECT * FROM ValidateTopology('topotest');
 }}}

 While the topology is valid the ValidateTopology call should return no
 rows.
 Ideally it would be called before and after the ST_ModEdgeSplit call.

 The report is based on current TRUNK version of liblwgeom.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3401>
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