public static function getAllComboGroupsByComboSetId($comboSetId) {
        global $wpdb;

        $csgt = Schema::getComboSetGroupsTable();
        $groupids = $wpdb->get_results(
            $wpdb->prepare("SELECT ID FROM {$csgt} WHERE combo_set_id = %d ORDER BY position ASC", (int)$comboSetId),
            ARRAY_A
        );

        if ($groupids === null) {
            return Master::getErrorStore()->getErrorResponse(ErrorStore::INTERNAL_SERVER_ERROR);
        }

        $groups = [];
        foreach ($groupids as $groupid) {
            $group = self::getComboGroupById($groupid['ID']);
            if (!empty($group)) {
                $groups[] = $group;
            }
        }

        return $groups;
    }