function getSpan(sSpan) {
				const result = parseInt(sSpan);
				return isNaN(result) ? 1 : result;
			}
Returns the header span of a given column. If <code>iLevel</code> is provided, the header span of that
header row is returned if there is any defined, otherwise the maximum header span is returned.
If there is no header span for the level, 1 is returned as a default value.

@param {sap.ui.table.Column} oColumn Column of which the header span shall be returned.
@param {int} [iLevel=0] Zero-based index of the header span for multi-labels.
@returns {int} Header span.