Get the table diffrence for the given changes.

        :param blueprint: The blueprint
        :type blueprint: Blueprint

        :param schema: The schema
        :type schema: orator.dbal.SchemaManager

        :rtype: orator.dbal.TableDiff

def _get_changed_diff(self, blueprint, schema):
        """
        Get the table diffrence for the given changes.

        :param blueprint: The blueprint
        :type blueprint: Blueprint

        :param schema: The schema
        :type schema: orator.dbal.SchemaManager

        :rtype: orator.dbal.TableDiff
        """
        table = schema.list_table_details(
            self.get_table_prefix() + blueprint.get_table()
        )

        return Comparator().diff_table(
            table, self._get_table_with_column_changes(blueprint, table)
        )