request for database identifier in the startup packet

Greetings,

The JDBC driver is currently keeping a per connection cache of types in the
driver. We are seeing cases where the number of columns is quite high. In
one case Prevent fetchFieldMetaData() from being run when unnecessary. ·
Issue #3241 · pgjdbc/pgjdbc (github.com)
<https://github.com/pgjdbc/pgjdbc/issues/3241> 2.6 Million columns.

If we knew that we were connecting to the same database we could use a
single cache across connections.

I think we would require a server/database identifier in the startup
message.

Dave Cramer