Merging of multipolygons fail/issues #12248
Labels
Bug
Either a bug report, or a bug fix. Let's hope for the latter!
Build/Install
Related to compiling or installing QGIS
Milestone
Author Name: Giovanni Manghi (@gioman)
Original Redmine Issue: 2188
Redmine category:build/install
Assignee: nobody -
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 #12247
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