public SelfT format(ClickHouseFormat format) {
        checkSealed();
        return option(ClickHouseClientOption.FORMAT, format);
    }
Sets format to be used for communication between server and client.

@param format preferred format, {@code null} means reset to default
@return the request itself
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseRequest.java