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Michael Paquier d8c3106bb6 Add back SQLValueFunction for SQL keywords 
This is equivalent to a revert of f193883 and fb32748, with the addition
that the declaration of the SQLValueFunction node needs to gain a couple
of node_attr for query jumbling.  The performance impact of removing the
function call inlining is proving to be too huge for some workloads
where these are used.  A worst-case test case of involving only simple
SELECT queries with a SQL keyword is proving to lead to a reduction of
10% in TPS via pgbench and prepared queries on a high-end machine.

None of the tests I ran back for this set of changes saw such a huge
gap, but Alexander Lakhin and Andres Freund have found that this can be
noticeable.  Keeping the older performance would mean to do more
inlining in the executor when using COERCE_SQL_SYNTAX for a function
expression, similarly to what SQLValueFunction does.  This requires more
redesign work and there is little time until 16beta1 is released, so for
now reverting the change is the best way forward, bringing back the
previous performance.

Bump catalog version.

Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/b32bed1b-0746-9b20-1472-4bdc9ca66d52@gmail.com
2023-05-17 10:19:17 +09:00
..
authentication libpq: Error message improvement 2023-05-16 08:59:34 +02:00
examples Update copyright for 2023 2023-01-02 15:00:37 -05:00
icu initdb: derive encoding from locale for ICU; similar to libc. 2023-03-10 10:51:24 -08:00
isolation Fix some typos and some incorrectly duplicated words 2023-04-18 14:03:49 +12:00
kerberos libpq: Error message improvement 2023-05-16 08:59:34 +02:00
ldap Fix various typos 2023-04-18 13:23:23 +12:00
locale Update copyright for 2023 2023-01-02 15:00:37 -05:00
mb Fix MB regression tests for WAL-logging of hash indexes. 2017-03-15 07:25:36 -04:00
modules Rename io_direct to debug_io_direct. 2023-05-15 10:31:14 +12:00
perl Add missing uninstallation rule for BackgroundPsql.pm 2023-05-02 09:41:03 +02:00
recovery Fix the race condition in the test case added by commit a6e04b1d20. 2023-05-09 14:25:33 +05:30
regress Add back SQLValueFunction for SQL keywords 2023-05-17 10:19:17 +09:00
ssl Fix errormessage for missing system CA in OpenSSL 3.1 2023-04-19 12:54:58 +02:00
subscription Fix typos in comments 2023-05-02 12:23:08 +09:00
Makefile Refactor PG_TEST_EXTRA logic in autoconf build 2022-09-20 11:24:16 -07:00
meson.build Update copyright for 2023 2023-01-02 15:00:37 -05:00
README Remove the option to build thread_test.c outside configure. 2020-10-21 12:08:48 -04:00

README 

PostgreSQL tests
================

This directory contains a variety of test infrastructure as well as some of the
tests in PostgreSQL. Not all tests are here -- in particular, there are more in
individual contrib/ modules and in src/bin.

Not all these tests get run by "make check". Check src/test/Makefile to see
which tests get run automatically.

authentication/
  Tests for authentication (but see also below)

examples/
  Demonstration programs for libpq that double as regression tests via
  "make check"

isolation/
  Tests for concurrent behavior at the SQL level

kerberos/
  Tests for Kerberos/GSSAPI authentication and encryption

ldap/
  Tests for LDAP-based authentication

locale/
  Sanity checks for locale data, encodings, etc

mb/
  Tests for multibyte encoding (UTF-8) support

modules/
  Extensions used only or mainly for test purposes, generally not suitable
  for installing in production databases

perl/
  Infrastructure for Perl-based TAP tests

recovery/
  Test suite for recovery and replication

regress/
  PostgreSQL's main regression test suite, pg_regress

ssl/
  Tests to exercise and verify SSL certificate handling

subscription/
  Tests for logical replication