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),...