src/Schema/CreateTableSqlGenerator.php
protected function getColumnComment(Column $column)
    {
        $comment = $column->getComment();

        if ($this->platform->isCommentedDoctrineType($column->getType())) {
            $comment .= $this->platform->getDoctrineTypeComment($column->getType());
        }

        return $comment;
    }
protected function getColumnComment(Column $column)
    {
        $comment = $column->getComment();

        if ($this->platform->isCommentedDoctrineType($column->getType())) {
            $comment .= $this->platform->getDoctrineTypeComment($column->getType());
        }

        return $comment;
    }
Full replacement of Doctrine\DBAL\Platforms\AbstractPlatform::getColumnComment,
check on updates!