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After an unexpected connection loss and successful reconnection, psql neglected to resynchronize its internal state about the server, such as server version. Ordinarily we'd be reconnecting to the same server and so this isn't really necessary, but there are scenarios where we do need to update --- one example is where we have a list of possible connection targets and they're not all alike. Define "resynchronize" as including connection_warnings(), so that this case acts the same as \connect. This seems useful; for example, if the server version did change, the user might wish to know that. An attuned user might also notice that the new connection isn't SSL-encrypted, for example, though this approach isn't especially in-your-face about such changes. Although this part is a behavioral change, it only affects interactive sessions, so it should not break any applications. Also, in do_connect, make sure that we desynchronize correctly when abandoning an old connection in non-interactive mode. These problems evidently are the result of people patching only one of the two places where psql deals with connection changes, so insert some cross-referencing comments in hopes of forestalling future bugs of the same ilk. Lastly, in Windows builds, issue codepage mismatch warnings only at startup, not during reconnections. psql's codepage can't change during a reconnect, so complaining about it again seems like useless noise. Peter Billen and Tom Lane. Back-patch to all supported branches. Discussion: https://postgr.es/m/CAMTXbE8e6U=EBQfNSe01Ej17CBStGiudMAGSOPaw-ALxM-5jXg@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.