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Tom Lane c7461fc255 Show 'AS "?column?"' explicitly when it's important. ruleutils.c was coded to suppress the AS label for a SELECT output expression if the column name is "?column?", which is the parser's fallback if it can't think of something better. This is fine, and avoids ugly clutter, so long as (1) nothing further up in the parse tree relies on that column name or (2) the same fallback would be assigned when the rule or view definition is reloaded. Unfortunately (2) is far from certain, both because ruleutils.c might print the expression in a different form from how it was originally written and because FigureColname's rules might change in future releases. So we shouldn't rely on that. Detecting exactly whether there is any outer-level use of a SELECT column name would be rather expensive. This patch takes the simpler approach of just passing down a flag indicating whether there could be any outer use; for example, the output column names of a SubLink are not referenceable, and we also do not care about the names exposed by the right-hand side of a setop. This is sufficient to suppress unwanted clutter in all but one case in the regression tests. That seems like reasonable evidence that it won't be too much in users' faces, while still fixing the cases we need to fix. Per bug #17486 from Nicolas Lutic. This issue is ancient, so back-patch to all supported branches. Discussion: https://postgr.es/m/17486-1ad6fd786728b8af@postgresql.org		1 year ago
config	Pre-beta mechanical code beautification.	1 year ago
contrib	Add a new shmem_request_hook hook.	1 year ago
doc	doc: Mention pg_read_all_stats in description of track_activities	1 year ago
src	Show 'AS "?column?"' explicitly when it's important.	1 year ago
.cirrus.yml	Make upgradecheck a no-op in MSVC's vcregress.pl	1 year ago
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	4 years ago
.editorconfig	Add .editorconfig	3 years ago
.git-blame-ignore-revs	Add `23e7b38bf` to git-blame-ignore-revs.	1 year ago
.gitattributes	Remove trailing whitespace from *.sgml files.	1 year ago
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	5 years ago
COPYRIGHT	Update copyright for 2022	1 year ago
GNUmakefile.in	add missing tag from commit `b8c4261e5e`	2 years ago
HISTORY	Canonicalize some URLs	3 years ago
Makefile	Dynamically find correct installation docs in Makefile.	1 year ago
README	Canonicalize some URLs	3 years ago
README.git	Canonicalize some URLs	3 years ago
aclocal.m4	Probe $PROVE not $PERL while checking for modules needed by TAP tests.	2 years ago
configure	Stamp 15beta1.	1 year ago
configure.ac	Stamp 15beta1.	1 year ago

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/.