@invalidate_table_constraints
    def delete_index(self, table_name, column_names, db_tablespace=''):
        if isinstance(column_names, string_types):
            column_names = [column_names]
        name = self.create_index_name(table_name, column_names)
        sql = self.drop_index_string % {
            "index_name": self.quote_name(name),
            "table_name": self.quote_name(table_name),
        }
        self.execute(sql)
Deletes an index created with create_index.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/South-1.0.2/south/db/generic.py/DatabaseOperations.delete_index