#27338: Running an AlterField to change a CharField primary key to AutoField
               Reporter:  Tim Graham            |          Owner:  nobody
                   Type:  Cleanup/optimization  |         Status:  new
              Component:  Migrations            |        Version:  master
               Severity:  Normal                |       Keywords:
           Triage Stage:  Accepted              |      Has patch:  0
    Needs documentation:  0                     |    Needs tests:  0
Patch needs improvement:  0                     |  Easy pickings:  0
                  UI/UX:  0                     |
 For example: change `id = models.CharField(max_length=20,
 primary_key=True)` to `id = models.AutoField(primary_key=True)`. It
 generates this operation:
     field=models.AutoField(primary_key=True, serialize=False),
 Running it on PostgreSQ gives: `django.db.utils.ProgrammingError: operator
 class "varchar_pattern_ops" does not accept data type integer`. I'm not
 sure if this can be made to work sensibly. Is it possible to autopopulate
 the `AutoField`? I ran into this situation while investigating #27267.

Ticket URL: <https://code.djangoproject.com/ticket/27338>
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