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Andres Freund 3170aece14 backport: Improve handling of empty query results in BackgroundPsql 
This is a backport of 70291a3c66. Originally it was only applied to master,
but I (Andres) am planning to fix a few bugs in BackgroundPsql that are harder
to fix in the backbranches with the old behavior. It's also generally good for
test infrastructure to behave similarly across branches, to avoid pain during
backpatching.  70291a3c66 changes the behavior in some cases, but after
discussing it, we are ok with that, it seems unlikely that there are
out-of-core tests relying on the prior behavior.

Discussion: https://postgr.es/m/ilcctzb5ju2gulvnadjmhgatnkxsdpac652byb2u3d3wqziyvx@fbuqcglker46

Michael's original commit message:

A newline is not added at the end of an empty query result, causing the
banner of the hardcoded \echo to not be discarded.  This would reflect
on scripts that expect an empty result by showing the "QUERY_SEPARATOR"
in the output returned back to the caller, which was confusing.

This commit changes BackgroundPsql::query() so as empty results are able
to work correctly, making the first newline before the banner optional,
bringing more flexibility.

Note that this change affects 037_invalid_database.pl, where three
queries generated an empty result, with the script relying on the data
from the hardcoded banner to exist in the expected output.  These
queries are changed to use query_safe(), leading to a simpler script.

The author has also proposed a test in a different patch where empty
results would exist when using BackgroundPsql.

Author: Jacob Champion
Reviewed-by: Andrew Dunstan, Michael Paquier
Discussion: https://postgr.es/m/CAOYmi+=60deN20WDyCoHCiecgivJxr=98s7s7-C8SkXwrCfHXg@mail.gmail.com
2025-02-19 09:45:29 -05:00
config Log LLVM library version in configure output. 2023-10-22 14:29:00 +13:00
contrib Handle default NULL insertion a little better. 2025-01-29 15:31:55 -05:00
doc Release notes for 17.4, 16.8, 15.12, 14.17, 13.20. 2025-02-16 14:20:33 -05:00
src backport: Improve handling of empty query results in BackgroundPsql 2025-02-19 09:45:29 -05:00
.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 Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:10:00 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:06 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Stamp 14.17. 2025-02-17 16:15:49 -05:00
configure.ac Stamp 14.17. 2025-02-17 16:15:49 -05:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:54 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:53 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
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/.