select_related() does not work with inherited models

[Pavel Lang]

Example code:

from django.db import models

class BaseModel(models.Model):
    base_text = models.TextField()

class InheritedA(BaseModel):
    textA = models.TextField()

class InheritedB(BaseModel):
    textB = models.TextField()

Now, when I select BaseModel.objects.all() there is no (possible/easy) way to prefetch related models InheritedA and InheritedB with left outer join and reduce further queries to get each inherited instance of models.

When model inheritance is alowed and modeled as OneToOne relation, it should be possible to do optimization in same sense as select_related() do with foreign keys.

[Alex Gaynor]

This is a duplicate of #7270.