Each instance of DataPilotFieldFilter represents a filtering
condition. It is used when evaluating a row in a data source whether or not
to include it in a filtered subset of the original data. For example, for
a given row to be included in the output of a drill-down data table, the row
must match every single instance of DataPilotFieldFilter to be
qualified. If the field specified by the value of FieldName
is not found, then that filter condition will not be evaluated.
Note that this struct is typically used in a sequence and is not normally
used as a single instance.