/**
* Gets an SQL column alias for a column name.
*
* @param string $columnName
* @return string
*/
public function getSQLColumnAlias($columnName)
{
// Trim the column alias to the maximum identifier length of the platform.
// If the alias is to long, characters are cut off from the beginning.
return $this->_platform->getSQLResultCasing(substr($columnName . $this->_aliasCounter++, -$this->_platform->getMaxIdentifierLength()));
}