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Tom Lane 6f0b632f08 Support testing of cases where table schemas change after planning. 
We have various cases where we allow DDL on tables to be performed with
less than full AccessExclusiveLock.  This requires concurrent queries
to be able to cope with the DDL change mid-flight, but up to now we had
no repeatable way to test such cases.  To improve that, invent a test
module that allows halting a backend after planning and then resuming
execution once we've done desired actions in another session.  (The same
approach could be used to inject delays in other places, if there's a
suitable hook available.)

This commit includes a single test case, which is meant to exercise the
previously-untestable ExecCreatePartitionPruneState code repaired by
commit 7a980dfc6.  We'd probably not bother with this if that were the
only foreseen benefit, but I expect additional test cases will use this
infrastructure in the future.

Test module by Andy Fan, partition-addition test case by me.

Discussion: https://postgr.es/m/20200802181131.GA27754@telsasoft.com
 		2020-08-07 14:30:47 -04:00
config Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
contrib Remove obsolete amcheck comment. 2020-08-06 16:23:52 -07:00
doc doc: clarify "state" table reference in tutorial 2020-08-05 17:12:10 -04:00
src Support testing of cases where table schemas change after planning. 2020-08-07 14:30:47 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:45 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Define OPENSSL_API_COMPAT 2020-07-19 12:14:42 +02:00
configure.ac Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00

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/.