showGroups (showSections) {
        logger.warnOnce('consider using dataTable.showSections instead of dataTable.showGroups for clarity');
        if (!arguments.length) {
            return this.showSections();
        }
        return this.showSections(showSections);
    }
Backward-compatible synonym for {@link DataTable#showSections showSections}.
@param {Boolean} [showSections=true]
@returns {Boolean|DataTable}