def get_gradebook_column_query_session_for_gradebook(self, gradebook_id=None, proxy=None):
if gradebook_id is None or proxy is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the gradebook column query service for the given gradebook.

        arg:    gradebook_id (osid.id.Id): the ``Id`` of the gradebook
        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.grading.GradebookColumnQuerySession) - a
                ``GradebookColumnQuerySession``
        raise:  NotFound - ``gradebook_id`` not found
        raise:  NullArgument - ``gradebook_id`` or ``proxy`` is ``null``
        raise:  OperationFailed - ``unable to complete request``
        raise:  Unimplemented - ``supports_gradebook_column_query()`` or
                ``supports_visible_federation()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_gradebook_column_query()`` and
        ``supports_visible_federation()`` are ``true``.*