function addSelect(vProperty) {
				var sPropertyName;
				if (!vProperty) {
					return;
				}
				sPropertyName = typeof vProperty === "string" ? vProperty : vProperty.name;
				if (!that._oSelectedPropertyNames[sPropertyName]) {
					sSelectOption += (sSelectOption == "" ? "" : ",") + sPropertyName;
					that._oSelectedPropertyNames[sPropertyName] = true;
				}
			}
Get the value of a query option for the OData request URI corresponding
to this request.

@param {string}
           sQueryOptionName Identifies the query option: $select,
           $filter,$orderby ... or any custom query option

@returns {string} The value of the requested query option or null, if
         this option is not used for the OData request.
@public
@function
@name sap.ui.model.analytics.odata4analytics.QueryResultRequest#getURIQueryOptionValue