function getFilter(aFilters, bAnd) {
			if (aFilters.length === 1) {
				return aFilters[0];
			}
			if (aFilters.length > 1) {
				return new Filter(aFilters, bAnd);
			}
			return undefined;
		}
Groups filters according to their path and combines filters on the same path using "OR" and filters on
different paths using "AND", all multi-filters contained are ANDed.

@param {sap.ui.model.Filter[]} [aFilters] The filters to be grouped
@return {sap.ui.model.Filter|undefined} A single filter containing all filters of the array combined or
  <code>undefined</code> if no filters are given
@throws {Error} If the {@link sap.ui.model.Filter.NONE} is contained in <code>aFilters</code> together
  with other filters
@public
@since 1.71
@static