postgresql

mirror of https://git.postgresql.org/git/postgresql.git synced 2025-01-12 18:34:36 +08:00

Go to file

Thomas Munro 212fab9926 Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux). Originally committed as `15bc038f` (plus some follow-ups), this was reverted in `28e07270` due to a problem discovered in parallel workers. This new version corrects that problem by sending the list of uncommitted enum values to parallel workers. Here follows the original commit message describing the change: To prevent possibly breaking indexes on enum columns, we must keep uncommitted enum values from getting stored in tables, unless we can be sure that any such column is new in the current transaction. Formerly, we enforced this by disallowing ALTER TYPE ... ADD VALUE from being executed at all in a transaction block, unless the target enum type had been created in the current transaction. This patch removes that restriction, and instead insists that an uncommitted enum value can't be referenced unless it belongs to an enum type created in the same transaction as the value. Per discussion, this should be a bit less onerous. It does require each function that could possibly return a new enum value to SQL operations to check this restriction, but there aren't so many of those that this seems unmaintainable. Author: Andrew Dunstan and Tom Lane, with parallel query fix by Thomas Munro Reviewed-by: Tom Lane Discussion: https://postgr.es/m/CAEepm%3D0Ei7g6PaNTbcmAh9tCRahQrk%3Dr5ZWLD-jr7hXweYX3yg%40mail.gmail.com Discussion: https://postgr.es/m/4075.1459088427%40sss.pgh.pa.us		2018-10-09 12:51:01 +13:00
config	Try another way to detect the result type of strerror_r().	2018-09-26 18:23:13 -04:00
contrib	Remove some unnecessary fields from Plan trees.	2018-10-07 14:33:17 -04:00
doc	Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux).	2018-10-09 12:51:01 +13:00
src	Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux).	2018-10-09 12:51:01 +13:00
.dir-locals.el	Update documentation editor setup instructions	2018-07-13 21:23:41 +02:00
.gitattributes
.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	Make assorted performance improvements in snprintf.c.	2018-10-03 10:18:15 -04:00
configure.in	Make assorted performance improvements in snprintf.c.	2018-10-03 10:18:15 -04:00
COPYRIGHT	Update copyright for 2018	2018-01-02 23:30:12 -05:00
GNUmakefile.in	Remove unwanted "garbage cleanup" logic in Makefiles.	2018-08-08 14:32:29 -04:00
HISTORY
Makefile	Fix non-GNU makefiles for AIX make.	2017-11-30 00:57:22 -08:00
README
README.git

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/.