The QGIS Geometry Generator seems like a nice way to keep data intact while allowing for some creative visualisations.
I have a layer of tesselating polygons that I would like to style as a continuous surface without internal borders.
To dissolve a number of polygons in Spatialite I would use the UNION function, but Union in the Geometry Generator doesn't give a result, ie:
union( $geometry, $geometry )
So is it possible to use the Geometry Generator to show a polygon layer as dissolved, and if so, how?
Answer
You can now do this with the geometry generator in QGIS 2.99/3.0 by using buffer(collect($geometry),0) in the expression builder.
The new collect() aggregate function collects all the feature geometries into a multipolygon; buffer() converts it into a single polygon to be styled as such.
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