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Tom Lane b1b71f1658 Fix race conditions when an event trigger is added concurrently with DDL. 
EventTriggerTableRewrite crashed if there were table_rewrite triggers
present, but there had not been when the calling command started.

EventTriggerDDLCommandEnd called ddl_command_end triggers if present,
even if there had been no such triggers when the calling command started,
which would lead to a failure in pg_event_trigger_ddl_commands.

In both cases, fix by doing nothing; it's better to wait till the next
command when things will be properly initialized.

In passing, remove an elog(DEBUG1) call that might have seemed interesting
four years ago but surely isn't today.

We found this because of intermittent failures in the buildfarm.  Thanks
to Alvaro Herrera and Andrew Gierth for analysis.

Back-patch to 9.5; some of this code exists before that, but the specific
hazards we need to guard against don't.

Discussion: https://postgr.es/m/5767.1523995174@sss.pgh.pa.us
2018-04-20 17:15:31 -04:00
config Use ARMv8 CRC instructions where available. 2018-04-04 12:22:45 +03:00
contrib Change more places to be less trusting of RestrictInfo.is_pushed_down. 2018-04-20 15:19:16 -04:00
doc Improve docs for the new INCLUDE directive in CREATE/ALTER TABLE. 2018-04-18 05:45:32 -04:00
src Fix race conditions when an event trigger is added concurrently with DDL. 2018-04-20 17:15:31 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Add configure infrastructure (--with-llvm) to enable LLVM support. 2018-03-20 17:26:25 -07:00
configure Use ARMv8 CRC instructions where available. 2018-04-04 12:22:45 +03:00
configure.in Use ARMv8 CRC instructions where available. 2018-04-04 12:22:45 +03:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Have "make coverage" recurse into contrib as well 2016-09-05 18:44:36 -03:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
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/.