[postgis-tickets] [PostGIS] #2173: ST_Split fails to split on existing vertex

[PostGIS]

#2173: ST_Split fails to split on existing vertex
---------------------+------------------------------------------------------
 Reporter:  strk     |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  medium   |   Milestone:  PostGIS 2.0.3
Component:  postgis  |     Version:  2.0.x        
 Keywords:           |  
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Comment(by strk):

 Further reduction:
 {{{
 Geom:
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
 Split point: 14
 }}}

 Or in a self-contained test:
 {{{
 with inp as (
  SELECT
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
   ::geometry as g,
   14 as p
 )
 select st_equals(
   g,
   st_union(
     st_geometryn(st_split(g, st_pointn(g,p)), 1),
     st_geometryn(st_split(g, st_pointn(g,p)), 2)
   )
 ) from inp;
 }}}

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2173#comment:2>
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