When using messenger with Oracle. The following exception happens:

In Connection.php line 453:
                                    
  [ErrorException]                  
  Notice: Undefined index: headers  
                                    
Exception trace:
  at /var/www/app/vendor/symfony/doctrine-messenger/Transport/Connection.php:453
 Symfony\Component\Messenger\Bridge\Doctrine\Transport\Connection->decodeEnvelopeHeaders()

The reason for this exception is because most Oracle databases use all caps table and field names. This is not a problem for updating and saving but when messenger tries to get the messages it will result in a response with all caps field names.

By selecting the was we do SELECT table.foo as "foo" we force the result to be lowercase even when the actual field is all caps.