public function getAlters()
    {
        $queries = [];
        if ($this->tablesAlter === null) {
            return $queries;
        }

        $platform = $this->connection->getDatabasePlatform();

        /** @var $tableDiff TableDiff */
        foreach ($this->tablesAlter as $tableName => $tableDiff) {
            $queries[$tableName] = $platform->getAlterTableSQL($tableDiff);
        }

        return $queries;
    }