Piwik\Plugins\Referrers\API::removeSubtableMetadata PHP Method

    private function removeSubtableMetadata($dataTable)
    {
        if ($dataTable instanceof DataTable\Map) {
            foreach ($dataTable->getDataTables() as $childTable) {
                $this->removeSubtableMetadata($childTable);
            }
        } else {
            foreach ($dataTable->getRows() as $row) {
                $row->deleteMetadata('idsubdatatable_in_db');
            }
        }
    }