Feature request #11569
Use ogr2ogr to Dissolve polygons
|Pull Request or Patch supplied:||No||Resolution:||fixed/implemented|
Apparently it is possible use ogr2ogr to dissolve polygons using GDAL compiled with SpatiaLite support. Example:
ogr2ogr output.shp input.shp -dialect sqlite -sql "SELECT ST_Union(geometry), dissolve_field FROM input GROUP BY dissolve_field"
For more details see: http://gis.stackexchange.com/questions/85028/dissolve-aggregate-polygons-with-ogr2ogr-or-gpc)
This would be a nice addition to Processing, since QGIS native Dissolve is rather slow. It would also be useful to be able to summarize the contents of the Dissolved features (i.e. sum, subtract, multiply etc).