def get_gradebook_column_summary_query(self):
raise errors.Unimplemented()<EOL>
Gets the query interface for a gradebook column summary.

        Multiple retrievals produce a nested ``OR`` term.

        return: (osid.grading.GradebookColumnSummaryQuery) - the
                gradebook column summary query
        raise:  Unimplemented -
                ``supports_gradebook_column_summary_query()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_gradebook_column_summary_query()`` is ``true``.*