public static String readFixedString(ClickHouseInputStream input, int length) throws IOException {
        return readFixedString(input, length, null);
    }
Read string with fixed length from given input stream.

@param input  non-null input stream
@param length byte length of the string
@return string with fixed length
@throws IOException when failed to read value from input stream or reached
                    end of the stream
clickhouse-data/src/main/java/com/clickhouse/data/format/BinaryStreamUtils.java