@Override
	protected Object getColumnValue(T t) {
		return threadedModel.getCachedColumnValueForRow(t, sortColumn);
	}
This version of the constructor is used for the default case where the client will 
supply a backup row comparator that will get called if the given column comparator returns
a '0' value.

@param model the table model using this comparator
@param sortColumn the column being sorted
@param comparator the column comparator to use for sorting
@param backupRowComparator the backup row comparator
@see RowBasedColumnComparator
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/threaded/ThreadedTableColumnComparator.java