Doctrine select with null

Question

是否有可能执行以下操作：

$builder = $this->getEntityManager()->createQueryBuilder();
$builder->select(
        'f.id',
        ...
        'NULL AS missing_attribute'
    )
    ->from(..., 'f')
    ...;

并避免：

Doctrine\ORM\Query\QueryException: ... got 'NULL'

Answer 1

https://github.com/doctrine/orm/issues/1670#issuecomment-591495663的解决方法：选择NULLIF(1,1) AS ...而不是NULL AS ...