I have a layer with lots of (spatially grouped) lines - lines belonging to a group share the same value in a field. I would like create convex hulls around each of these groups using QGIS 3.8. I learned that Vector Geometry->Convex hull is not attribute specific and the batch functionality works with a set of layers, not specific on attributes.
I tried the model builder, but I'm struggling - I would need to first create a set of objects grouped by that attribute (in SQL it would be something like "GROUP BY"), and then something like a "do convex hull for each in set".
Or create a number of new layers based on the attribute and use convex hull in batch mode? This would be ~100 new layers - could this be handled with QGIS?