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Peter Geoghegan 4061992ea8 Update obsolete row compare preprocessing comments. 
We have some limited ability to detect redundant and contradictory
conditions involving an nbtree row comparison key following commits
f09816a0 and bd3f59fd: we can do so in simple cases involving IS NULL
and IS NOT NULL keys on a row compare key's first column.  We can
likewise determine that a scan's qual is unsatisfiable given a row
compare whose first subkey's arg is NULL.  Update obsolete comments that
claimed that we merely copied row compares into the output key array
"without any editorialization".

Also update another _bt_preprocess_keys header comment paragraph: add a
parenthetical remark that points out that preprocessing will generate a
skip array for the preceding example qual.  That will ultimate lead to
preprocessing marking the example's lower-order y key required -- which
is exactly what the example supposes cannot happen.  Keep the original
comment, though, since it accurately describes the mechanical rules that
determine which keys get marked required in the absence of skip arrays
(which can occasionally still matter).  This fixes an oversight in
commit 92fe23d9, which added the nbtree skip scan optimization.

Author: Peter Geoghegan <pg@bowt.ie>
Backpatch-through: 18
2025-11-29 16:41:49 -05:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Don't put library-supplied -L/-I switches before user-supplied ones. 2025-07-29 15:17:40 -04:00
contrib postgres_fdw: Add more test coverage for EvalPlanQual testing. 2025-11-06 12:15:01 +09:00
doc doc: Fix misleading synopsis for CREATE/ALTER PUBLICATION. 2025-11-27 23:30:51 +09:00
src Update obsolete row compare preprocessing comments. 2025-11-29 16:41:49 -05:00
.abi-compliance-history Update .abi-compliance-history for change to CreateStatistics(). 2025-11-17 14:14:41 -06:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:53 -04:00
.cirrus.tasks.yml ci: Improve OpenBSD core dump backtrace handling. 2025-11-06 17:49:22 +13:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:33:44 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2025-10-21 10:02:19 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:22 +02:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Stamp 18.1. 2025-11-10 16:52:06 -05:00
configure.ac Stamp 18.1. 2025-11-10 16:52:06 -05:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00
meson.build Add check for large files in meson.build 2025-11-12 09:02:29 +09:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
README.md Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00

README.md

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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.