5955d93419
We had some pretty ad-hoc handling of the public schema and the plpgsql extension, which are both presumed to exist in template0 but might be modified or deleted in the database being dumped. Up to now, by default pg_dump would emit a CREATE EXTENSION IF NOT EXISTS command as well as a COMMENT command for plpgsql. The usefulness of the former is questionable, and the latter caused annoying errors in non-superuser dump/restore scenarios. Let's instead install a rule that built-in extensions (identified by having low-numbered OIDs) are not to be dumped. We were doing it that way already in binary-upgrade mode, so this just makes regular mode behave the same. It remains true that if someone has installed a non-default ACL on the plpgsql language, that will get dumped thanks to the pg_init_privs mechanism. This is more consistent with the handling of built-in objects of other kinds. Also, change the very ad-hoc mechanism that was used to avoid dumping creation and comment commands for the public schema. Instead of hardwiring a test in _printTocEntry(), make use of the DUMP_COMPONENT_ infrastructure to mark that schema up-front about what we want to do with it. This has the visible effect that the public schema won't be mentioned in the output at all, except for updating its ACL if it has a non-default ACL. Previously, while it was normally not mentioned, --clean mode would drop and recreate it, again causing headaches for non-superuser usage. This change likewise makes the public schema less special and more like other built-in objects. If plpgsql, or the public schema, has been removed entirely in the source DB, that situation won't be reproduced in the destination ... but that was true before. Discussion: https://postgr.es/m/29048.1516812451@sss.pgh.pa.us |
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README
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/.