[QGIS-trac] [Quantum GIS] #2188: Merging of multipolygons fail/issues

[Quantum GIS]

#2188: Merging of multipolygons fail/issues
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   Reporter:  lutra                             |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.4.0
  Component:  Build/Install                     |            Version:  HEAD         
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  Yes          
Status_info:  0                                 |  
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 This ticket was open after the observations made here

 http://lists.osgeo.org/pipermail/qgis-developer/2009-December/008552.html

 To replicate:
 use the "regions" layer you can find in the spatialite sample dataset: you
 can save it as shapefile and import to postgis. Tested also with other
 layers, like the "world borders" vector.


 a) In postgis and Spatialite (in a multipolygon type of layer), merging
 adjacent or overlapping features returns

 "The union operation would result in a geometry type that is not
 compatible with the current layer and therefore is canceled"

 b) The same message appear when you try to merge non adjacent or non
 overlapping features (or features with islands) in shapes

 c) With Postgis and spatialite is still possible to merge non adjacent or
 non overlapping features (or features with islands), but actually in trunk
 (not in 1.3) it returns errors see #2187

-- 
Ticket URL: <https://trac.osgeo.org/qgis/ticket/2188>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats