原则部分选择加载整个对象

Question

来自MyEntityRepository

$qb = $this->createQueryBuilder('e')
    ->select('partial e.{id, field0}')
;
echo $qb->getQuery()->getSQL();

给我

SELECT
  e0_.id AS id_0
, e0_.field0_0 AS field0_0
, e0_.field1_1 AS field1_1
, e0_.field2_2 AS field2_2
, -- ...
FROM my_entity e0_

为什么选择我的所有字段？

与Doctrine partial queries return the complete object相同，不同之处在于我输入了错误的初始SQL。