Oracle adapter statement is not behavin correctly when error mode is Doctrine_Core::ERRMODE_SILENT or Doctrine_Core::ERRMODE_WARNING

Fetch column method looks like this:

public function fetchColumn($columnIndex = 0)
{
if ( ! is_integer($columnIndex)) {
$this->handleError(array('message'=>"columnIndex parameter should be numeric"));
}
$row = $this->fetch(Doctrine_Core::FETCH_NUM);
return $row[$columnIndex];
}

Method handleError() not always throws an exception, and by passing it a string or any other variable type than integer will result in warning.

Fix (depending on what is considered to be required by interface):

if ( ! is_integer($columnIndex)) {
$this->handleError(array('message'=>"columnIndex parameter should be numeric"));
return false;
}

or

if ( ! is_integer($columnIndex)) {
throw new Doctrine_Adapter_Exception("columnIndex parameter should be numeric");
}