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David Rowley 55b4966365 Fix misleading comment for get_cheapest_group_keys_order 
The header comment for get_cheapest_group_keys_order() claimed that the
output arguments were set to a newly allocated list which may be freed by
the calling function, however, this was not always true as the function
would simply leave these arguments untouched in some cases.

This tripped me up when working on 1349d2790 as I mistakenly assumed I
could perform a list_concat with the output parameters.  That turned out
bad due to list_concat modifying the original input lists.

In passing, make it more clear that the number of distinct values is
important to reduce tiebreaks during sorts.  Also, explain what the
n_preordered parameter means.

Backpatch-through: 15, where get_cheapest_group_keys_order was introduced.
2022-09-20 10:03:26 +12:00
config Bump minimum Perl version to 5.14 2022-09-14 12:37:04 +07:00
contrib postgres_fdw: Remove useless DO block in test 2022-09-16 15:57:34 +02:00
doc Add missing serial commas 2022-09-19 06:35:01 -04:00
src Fix misleading comment for get_cheapest_group_keys_order 2022-09-20 10:03:26 +12:00
.cirrus.yml ci: remove minor version from freebsd image name 2022-07-31 18:51:47 -07:00
.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
.git-blame-ignore-revs Add b2e6e7682 to .git-blame-ignore-revs 2022-09-08 14:06:59 +07:00
.gitattributes Remove trailing whitespace from *.sgml files. 2022-04-20 11:04:49 -04:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Remove DLLTOOL, DLLWRAP from configure / Makefile.global.in 2022-09-17 09:15:12 -07:00
configure.ac Remove DLLTOOL, DLLWRAP from configure / Makefile.global.in 2022-09-17 09:15:12 -07:00
COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
GNUmakefile.in Run tests of libpq on installcheck-world, checkprep and check-world 2022-06-03 13:15:20 +09:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
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

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/.