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Tom Lane 0b29b41e5b Fix misbehavior of DROP OWNED BY with duplicate polroles entries. 
Ordinarily, a pg_policy.polroles array wouldn't list the same role
more than once; but CREATE POLICY does not prevent that.  If we
perform DROP OWNED BY on a role that is listed more than once,
RemoveRoleFromObjectPolicy either suffered an assertion failure
or encountered a tuple-updated-by-self error.  Rewrite it to cope
correctly with duplicate entries, and add a CommandCounterIncrement
call to prevent the other problem.

Per discussion, there's other cleanup that ought to happen here,
but this seems like the minimum essential fix.

Per bug #17062 from Alexander Lakhin.  It's been broken all along,
so back-patch to all supported branches.

Discussion: https://postgr.es/m/17062-11f471ae3199ca23@postgresql.org
2021-06-18 18:00:09 -04:00
config Use return instead of exit() in configure 2020-09-08 10:09:43 +02:00
contrib Detect unused steps in isolation specs and do some cleanup 2021-06-17 11:57:44 +09:00
doc Document a few caveats in synchronous logical replication. 2021-06-17 11:44:35 +05:30
src Fix misbehavior of DROP OWNED BY with duplicate polroles entries. 2021-06-18 18:00:09 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Fix whitespace and remove obsolete gitattributes entry 2016-03-13 16:03:13 -04:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Support use of strnlen() in pre-v11 branches. 2021-06-07 13:12:35 -04:00
configure.in Support use of strnlen() in pre-v11 branches. 2021-06-07 13:12:35 -04:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:24 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:35:43 -04:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:41:15 +12:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

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/.