"Chuck McDevitt" <cmcdevitt(at)greenplum(dot)com> writes:
> Is protocol version 2 still used by anything? Is there a reason why
> this is still supported?
Even if you're not concerned about breaking old clients, I believe that
the JDBC folk are still giving out advice to use ProtocolVersion=2 as
a workaround for various arcane portability issues for Java clients.
In any case, AFAICS there's no very good reason to remove it. The
amount of backend code involved is pretty trivial.
regards, tom lane