There's been a lively discussion on JDBC list recently about how we
handle connection pooling. This has connected a few thoughts in my head.

That's made me think about the PHP interface, which issues a 
pair every time somebody connects to the pool.

We should have a single/consistent way of starting a new connection to
PostgreSQL when using a session pool.

As committed, DISCARD ALL does everything but cannot be issued inside a
transaction block.

I'd like to propose that DISCARD ALL also issue a ROLLBACK command if it
is issued from within a transaction block. That way whenever we reassign
a session pool connection to another agent we can just issue a single
command from all interfaces, without needing to test what the state of
the connection is beforehand.

  Simon Riggs

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