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Tom Lane 90893c7b7c Fix EXPLAIN of dummy set operations some more. 
EXPLAIN failed to deal with varno-0 Vars that are made by prepunion.c
and can survive into a finished plan in the case where a provably
empty set operation is replaced by a dummy Result (which is possible
since 03d40e4b5).  Commit 928df067d tried to fix this, but it was a
couple bricks shy of a load.  First, it only dealt with varno-0 Vars
at the top level of the Result's tlist, but they could be buried
under coercion expressions.  Fix that by doing a recursive mutation.
Second, it always replaced varno 0 with varno 1, but that's just
wrong: the Result might represent a group of setop leaf queries that
do not include the leftmost leaf.  That led to displaying the wrong
variable(s) as outputs of the Result, risking confusion.  Fortunately,
we can get the actual child relids from the recently-added
Result.relids field, and use that to discover the leftmost child
represented by the Result.

This was found while discussing bug #19742, but it's really an
independent issue.

Author: shihao zhong <zhong950419@gmail.com>
Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAGRkXqTFwygKmjLG_Y=kbXRHsePFmD6k+qrzVLP4_KrG+-=oRg@mail.gmail.com
Backpatch-through: 19
2026-10-05 11:47:57 -04:00
.github ci: Generate crashlogs on Windows 2026-07-17 11:48:35 -04:00
config Revert "Use -isystem for LLVM include directories" 2026-09-12 15:50:08 +02:00
contrib amcheck: Allow interrupting the child-level rightlink walk 2026-10-05 13:32:00 +03:00
doc postgres_fdw: Fix corner cases in transaction mode propagation. 2026-10-05 16:15:00 +09:00
src Fix EXPLAIN of dummy set operations some more. 2026-10-05 11:47:57 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs 2026-09-02 09:32:50 +02:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.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 Use warning option -Wshadow=local 2026-09-24 11:15:27 +02:00
configure.ac Use warning option -Wshadow=local 2026-09-24 11:15:27 +02:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
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 Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build Use warning option -Wshadow=local 2026-09-24 11:15:27 +02:00
meson_options.txt Revert "Add built-in fuzzing harnesses for security testing." 2026-04-10 09:53:58 -04:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.