Database migration fails with postgresql 8.x with rest_framework.authtoken

[Kester Habermann]

manage.py migrate fails when these are added to INSTALLED_APPS:
'rest_framework',
'rest_framework.authtoken',

The problem is present when using postgresql-8.4.20 (RHEL 6)
Django==1.11.6
djangorestframework==3.7.1
psycopg2==2.6.1
Python 2.7

The problem first appeared in Django==1.11.2 and is present in 1.11.6, too. It works with Django==1.11.1. This is due to a change in this file:
$VIRTUAL_ENV/lib/python2.7/site-packages/django/db/backends/postgresql/introspection.py

If the file from Django==1.11.1 is copied to Django==1.11.6, the "migrate" works again.

The problem is not present with postgresql-9.2.21 (RHEL 7.4).

How to reproduce the problem:
1) create new project with django-admin startproject mysite
2) edit mysite/mysite/settings.py
add to INSTALLED_APPS = [ ]:
'rest_framework',
'rest_framework.authtoken',
change DATABASES
to a PostgreSQL 8.4.20 database.
3) python manage.py migrate

Full output

python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, authtoken, contenttypes, sessions
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying authtoken.0001_initial... OK
  Applying authtoken.0002_auto_20160226_1747...Traceback (most recent call last):
  File "./manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 204, in handle
    fake_initial=fake_initial,
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/migrations/executor.py", line 115, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/migrations/migration.py", line 129, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/migrations/operations/fields.py", line 215, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 515, in alter_field
    old_db_params, new_db_params, strict)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/postgresql/schema.py", line 112, in _alter_field
    new_db_params, strict,
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 524, in _alter_field
    fk_names = self._constraint_names(model, [old_field.column], foreign_key=True)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 989, in _constraint_names
    constraints = self.connection.introspection.get_constraints(cursor, model._meta.db_table)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/postgresql/introspection.py", line 233, in get_constraints
    """, [table_name])
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/utils.py", line 80, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/khaberma/work/python/django-11.1/venv-django-1.11.2/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: syntax error at or near "ORDER"
LINE 3:                 indexname, array_agg(attname ORDER BY rnum),...

[Tim Graham]

As per the ​Databases docs for Django 1.11, "Django supports PostgreSQL 9.3 and higher."

From the Django 1.8 release notes, "The end of upstream support periods was reached in July 2014 for PostgreSQL 8.4. As a consequence, Django 1.8 sets 9.0 as the minimum PostgreSQL version it officially supports."