avantgardnerio opened a new pull request, #2211:
URL: https://github.com/apache/arrow-rs/pull/2211
# Which issue does this PR close?
Closes #2210.
# Rationale for this change
Apache Arrow Ballista now supports FlightSQL, and can run simple statements
like select 1;, however due to its architecture, tables need to be registered
before any substantive queries can be run. Unfortunately, tables have to be
registered on a context, or else the next query will have no idea that they
were registered. The native Ballista protocol uses a [custom
field](https://github.com/apache/arrow-ballista/blob/6bd0f6a58d0a7bdaf75af2c2485d56d5a812bea3/ballista/rust/core/proto/ballista.proto#L668)
to implement this behavior, but for FlightSQL, we should use its [native
method](https://arrow.apache.org/docs/format/Flight.html#authentication).
However the existing FlightSqlService trait forces this [to
return](https://github.com/apache/arrow-rs/blob/bc493d92c2a032a95d92dab81642f05182f20d81/arrow-flight/src/sql/server.rs#L261)
an unimplemented Err.
# What changes are included in this PR?
Proxying of the `handshake()` method
# Are there any user-facing changes?
Other implementers of `FlightSqlService` will have to implement the method
(they can just return `NotImplemented` as that was the previous behavior).
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