Spark dataset to byte array over grpc

[Ashwin Sai Shankar]

Hi!
I'm building a spark app which runs a spark-sql query and send results to
client over grpc(my proto file is configured to send the sql output as
"bytes"). The client then displays the output rows. When I run spark.sql, I
get a DataSet<Rows>. How do I convert this to byte array?
Also is there a better way to send this output to client?

Thanks,
Ashwin