@abc.abstractmethod<EOL><INDENT>def get_comments_by_query(self, comment_query):<DEDENT>
return<EOL>
Gets a list of comments matching the given search.

        :param comment_query: the search query array
        :type comment_query: ``osid.commenting.CommentQuery``
        :return: the returned ``CommentList``
        :rtype: ``osid.commenting.CommentList``
        :raise: ``NullArgument`` -- ``comment_query`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``comment_query`` is not of this service

        *compliance: mandatory -- This method must be implemented.*