Github user cramja commented on the issue: https://github.com/apache/incubator-quickstep/pull/230 @zuyu Thank you for the review Here's a possibility based on your overall comment: I could add the IOBase and its subclass GrpcWrapper to this PR. The IOBase abstracts around all IO (including LineReaders). The GrpcWrapper is a wrapper around server side interactions. Then the unit test would test communication between GrpcWrapper and the Client. I was thinking to add 1 new executable to Quickstep, that being the dumb client. All it really is is an interface for a user to send a query through. It just handles send and receive, therefore does no parsing/etc. That can come later if we want. Then in another PR the Cli exe can be modified to have the `--mode=server` option as you suggested.
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