getStringConditionFields( $this->getName(), $this->target->getName() ) ); } public function executeQuery( QueryProcessor $queryProcessor, string $parentKey = '' ) : void { global $wpdb ; } private function getUserMetaKeys() : array { global $wpdb ; return (array) $wpdb->get_col( "\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->usermeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key" ); } }