Tom Lane 72822a99d4 Avoid mislabeling of lateral references when pulling up a subquery. If we are pulling up a subquery that's under an outer join, and the subquery's target list contains a strict expression that uses both a subquery variable and a lateral-reference variable, it's okay to pull up the expression without wrapping it in a PlaceHolderVar. That's safe because if the subquery variable is forced to NULL by the outer join, the expression result will come out as NULL too, so we don't have to force that outcome by evaluating the expression below the outer join. It'd be correct to wrap in a PHV, but that can lead to very significantly worse plans, since we'd then have to use a nestloop plan to pass down the lateral reference to where the expression will be evaluated. However, when we do that, we should not mark the lateral reference variable as being nulled by the outer join, because it isn't after we pull up the expression in this way. So the marking logic added by `cb8e50a4a` was incorrect in this detail, leading to "wrong varnullingrels" errors from the consistency-checking logic in setrefs.c. It seems to be sufficient to just not mark lateral references at all in this case. (I have a nagging feeling that more complexity may be needed in cases where there are several levels of outer join, but some attempts to break it with that didn't succeed.) Per report from Bertrand Mamasam. Back-patch to v16, as the previous patch was. Discussion: https://postgr.es/m/CACZ67_UA_EVrqiFXJu9XK50baEpH=ofEPJswa2kFxg6xuSw-ww@mail.gmail.com		1 year ago
config	jit: Remove {llvm-config,clang}-N configure probes.	2 years ago
contrib	Clean up newlines following left parentheses	1 year ago
doc	Revert "Handle better implicit transaction state of pipeline mode"	1 year ago
src	Avoid mislabeling of lateral references when pulling up a subquery.	1 year ago
.cirrus.star	Remove duplicate words in docs and code comments.	2 years ago
.cirrus.tasks.yml	ci: Fix cached MacPorts installation management	1 year ago
.cirrus.yml	ci: Make compute resources for CI configurable	2 years ago
.dir-locals.el	…
.editorconfig	…
.git-blame-ignore-revs	Add commit `7229ebe011` to .git-blame-ignore-revs.	1 year ago
.gitattributes	Exclude LLVM files from whitespace checks	1 year ago
.gitignore	…
COPYRIGHT	Update copyright for 2024	2 years ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	2 years ago
HISTORY	…
Makefile	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
README.md	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
aclocal.m4	autoconf: Move export_dynamic determination to configure	3 years ago
configure	Update configure probes for CFLAGS needed for ARM CRC instructions.	1 year ago
configure.ac	Update configure probes for CFLAGS needed for ARM CRC instructions.	1 year ago
meson.build	Clean up <stdbool.h> reference in meson.build.	1 year ago
meson_options.txt	Allow selecting the git revision to be packaged by "make dist".	2 years ago

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.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.