[postgis-devel] [PostGIS] #1776: ST_SymDifference involging EMPTY not symmetric

[PostGIS]

#1776: ST_SymDifference involging EMPTY not symmetric
---------------------+------------------------------------------------------
 Reporter:  strk     |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  medium   |   Milestone:  PostGIS 2.0.1
Component:  postgis  |     Version:  2.0.x        
 Keywords:           |  
---------------------+------------------------------------------------------
 {{{
 strk=# SELECT ST_AsText(ST_SymDifference('POLYGON((0 0, 10 0, 10 10, 0
 0))', 'POLYGON EMPTY'));
            st_astext
 -------------------------------
  POLYGON((0 0,10 0,10 10,0 0))
 (1 row)

 strk=# SELECT ST_AsText(ST_SymDifference('POLYGON EMPTY', 'POLYGON((0 0,
 10 0, 10 10, 0 0))'));
    st_astext
 ---------------
  POLYGON EMPTY
 (1 row)
 }}}

 I belive the first answer is correct and the second should be equal to the
 first one

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1776>
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