Just curious:
With a hierarchical column, is there a way to search for any books that contain the
top level of an undefined value?
Book 1: foo, foo.bar
Book 2: foo.bar, test.123
Book 3: test
Since book 1 and 3 both have top-level tags, I want the search to match those, but not book 2.
I hope I explain this clear enough.
