mydialect.php

<?php

class MyDialect extends \Phalcon\Db\Dialect\Mysql
{
  /**
	 * Gets the column name in MySQL
	 *
	 * @param Phalcon\Db\ColumnInterface $column
	 * @return string
	 */
	public function getColumnDefinition($column)
	{
		if ($column->getType() <= 8) {
			return parent::getColumnDefinition($column);
		}

		//...
	}
}