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Tom Lane eae0e20def Remove over-optimistic Assert. 
In commit 2489d76c4, I'd thought it'd be safe to assert that a
PlaceHolderVar appearing in a scan-level expression has empty
nullingrels.  However this is not so, as when we determine that a
join relation is certainly empty we'll put its targetlist into a
Result-with-constant-false-qual node, and nothing is done to adjust
the nullingrels of the Vars or PHVs therein.  (Arguably, a Result
used in this way isn't really a scan-level node, but it certainly
isn't an upper node either ...)

It's not clear this is worth any close analysis, so let's just
take out the faulty Assert.

Per report from Robins Tharakan.  I added a test case based on
his example, just in case somebody tries to tighten this up.

Discussion: https://postgr.es/m/CAEP4nAz7Enq3+DEthGG7j27DpuwSRZnW0Nh6jtNh75yErQ_nbA@mail.gmail.com
2023-01-31 11:57:47 -05:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib Generate code for query jumbling through gen_node_support.pl 2023-01-31 15:24:05 +09:00
doc Make Vars be outer-join-aware. 2023-01-30 13:16:20 -05:00
src Remove over-optimistic Assert. 2023-01-31 11:57:47 -05:00
.cirrus.yml Fix typos in comments, code and documentation 2023-01-03 16:26:14 +09:00
.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 250c8ee07e to git-blame-ignore-revs 2023-01-13 15:33:49 -08:00
.gitattributes Remove trailing whitespace from *.sgml files. 2022-04-20 11:04:49 -04:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Update copyright for 2023 2023-01-02 15:00:37 -05:00
configure.ac Update copyright for 2023 2023-01-02 15:00:37 -05:00
COPYRIGHT Update copyright for 2023 2023-01-02 15:00:37 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:31 -05:00
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
meson.build meson: Fix installation path computation 2023-01-27 11:57:11 +01:00
meson_options.txt Update copyright for 2023 2023-01-02 15:00:37 -05:00
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/.