I have both 2.18.28 and 3.8.3 loaded on my computer. I have a Geopackage containing a line layer of hiking trails. The attribute table contains two fields:
- surface_type (text)
- length_miles (decimal)
I am trying to sum length_miles by surface_type, using the Statistics by Categories tool.
Using 2.18.28 the tool works perfectly.
However, at 3.8.3 the Field(s) with categories option is greyed out (please see highlighted screenshot). This is where I would normally select the surface_type field. Now that it is greyed out I cannot calculate miles by surface_type.
The Help section offers no clue. What am I doing wrong?