Querying abstract class in the middle of a hierarchy returns NULL instead of objects

[BenMorel]

I have the following entity hierarchy:

• (A)
  • B
  • (C)
    • D
    • E

Abstract classes are in parentheses.

When querying entities of class A, B, D or E, everything works fine.
When querying entities of class C however, Doctrine 2.6.0 returns null instead of the entity object.

I created a test case here:
https://github.com/BenMorel/doctrine-abstract-entity-bug

The script creates 3 concrete entities of classes B, D and E, then queries every class of the hierarchy.
Doctrine 2.5.14 returns the correct result:

Bug\A:
    Bug\E
    Bug\D
    Bug\B
Bug\B:
    Bug\B
Bug\C:
    Bug\E
    Bug\D
Bug\D:
    Bug\D
Bug\E:
    Bug\E

Doctrine 2.6.0, however, fails here:

Bug\A:
    Bug\E
    Bug\D
    Bug\B
Bug\B:
    Bug\B
Bug\C:
    NULL          <!>
    NULL          <!>
Bug\D:
    Bug\D
Bug\E:
    Bug\E

As you can see, querying entities of class Bug\C returns NULL and NULL, instead of Bug\D and Bug\E as expected.

[BenMorel]

Might be related to #6988, #6937, #7050.

[IljaN]

Also seeing same issue with inheritance type joined

[lcobucci]

@BenMorel can you please check if #6988 fixes it?

[BenMorel]

@lcobucci It works with #6988 ! 👍

[Ocramius]

Handled in #6988