How to support to connect GreenPlum with the 'django.db.backends.postgresql_psycopg2' ?

Hello,

I got an error when I tried to utilize the 'django.db.backends.postgresql_psycopg2' to connect Greenplum.Given,The Greenplum is based on PostgreSQL to develop and Djando's backend support to connect PostgreSQL,so I guess it should be support Greenplum to connect.After I modified the database configuration and executed the command like 

 python manage.py syncdb --noinput

I got an error as following: 

$ python manage.py syncdb --noinput

Syncing...

Creating tables ...

Creating table auth_permission

Traceback (most recent call last):

  File "manage.py", line 11, in <module>

    execute_from_command_line(sys.argv)

  File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line

    utility.execute()

  File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv

    self.execute(*args, **options.__dict__)

  File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute

    output = self.handle(*args, **options)

  File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 371, in handle

    return self.handle_noargs(**options)

  File "/usr/lib/python2.7/site-packages/south/management/commands/syncdb.py", line 90, in handle_noargs

    syncdb.Command().execute(**options)

  File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute

    output = self.handle(*args, **options)

  File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 371, in handle

    return self.handle_noargs(**options)

  File "/usr/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 102, in handle_noargs

    cursor.execute(statement)

  File "/usr/lib/python2.7/site-packages/django/db/backends/util.py", line 40, in execute

    return self.cursor.execute(sql, params)

  File "/usr/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 52, in execute

    return self.cursor.execute(query, args)

django.db.utils.DatabaseError: Greenplum Database does not allow having both PRIMARY KEY and UNIQUE constraints

I found it didn't work when I removed all UNIQUE constraints statements.So I want to get some proposals what to modify to support greenplum!

Thank you!

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