function getSimplePropertyKeys(oTable, vKeys) {
		const oPropertyHelper = oTable.getPropertyHelper();
		const aKeys = typeof vKeys[0] === "object" ? vKeys.map((oColumn) => oColumn.getPropertyKey()) : vKeys;

		return Array.from(new Set(aKeys.flatMap((sKey) => {
			return oPropertyHelper.getProperty(sKey)?.getSimpleProperties().map((oProperty) => oProperty.key) || [];
		})));
	}
Gets the keys of simple properties. For complex properties, the keys of the simple properties, which they reference, are collected. Keys of
properties that are not known to the property helper are filtered out and do not trigger a <code>fetchProperties</code> call.

@param {sap.ui.mdc.Table} oTable Instance of the table
@param {string[] | sap.ui.mdc.table.Column[]} vKeys The keys or the columns from which the keys are obtained
@returns {string[]} Keys of simply properties