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Álvaro Herrera 3231fd0455
Stop creating constraints during DETACH CONCURRENTLY 
Commit 71f4c8c6f7 (which implemented DETACH CONCURRENTLY) added code
to create a separate table constraint when a table is detached
concurrently, identical to the partition constraint, on the theory that
such a constraint was needed in case the optimizer had constructed any
query plans that depended on the constraint being there.  However, that
theory was apparently bogus because any such plans would be invalidated.

For hash partitioning, those constraints are problematic, because their
expressions reference the OID of the parent partitioned table, to which
the detached table is no longer related; this causes all sorts of
problems (such as inability of restoring a pg_dump of that table, and
the table no longer working properly if the partitioned table is later
dropped).

We'd like to get rid of all those constraints.  In fact, for branch
master, do that -- no longer create any substitute constraints.
However, out of fear that some users might somehow depend on these
constraints for other partitioning strategies, for stable branches
(back to 14, which added DETACH CONCURRENTLY), only do it for hash
partitioning.

(If you repeatedly DETACH CONCURRENTLY and then ATTACH a partition, then
with this constraint addition you don't need to scan the table in the
ATTACH step, which presumably is good.  But if users really valued this
feature, they would have requested that it worked for non-concurrent
DETACH also.)

Author: Haiyang Li <mohen.lhy@alibaba-inc.com>
Reported-by: Fei Changhong <feichanghong@qq.com>
Reported-by: Haiyang Li <mohen.lhy@alibaba-inc.com>
Backpatch-through: 14
Discussion: https://postgr.es/m/18371-7fef49f63de13f02@postgresql.org
Discussion: https://postgr.es/m/19070-781326347ade7c57@postgresql.org
2025-10-11 20:30:12 +02:00
..
authentication In username-map substitution, cope with more than one \1. 2025-07-13 13:52:32 -04:00
examples libpq: Deprecate pg_int64. 2025-03-25 21:40:00 +13:00
icu Update copyright for 2025 2025-01-01 11:21:55 -05:00
isolation Add stats_reset to pg_stat_user_functions 2025-10-08 12:43:40 +09:00
kerberos Replace deprecated log_connections values in docs and tests 2025-05-22 17:14:54 -04:00
ldap Add TAP tests for LDAP connection parameter lookup 2025-08-15 10:17:22 +02:00
locale Update copyright for 2025 2025-01-01 11:21:55 -05:00
mb
modules test_bitmapset: Improve random function 2025-10-10 07:20:03 +09:00
perl Fix missing "use Test::More" in Kerberos.pm. 2025-08-18 14:54:59 -04:00
postmaster Run pgperltidy 2025-06-29 21:14:21 -04:00
recovery Fix comments in recovery tests 2025-09-25 15:24:41 +02:00
regress Stop creating constraints during DETACH CONCURRENTLY 2025-10-11 20:30:12 +02:00
ssl Fix sslkeylogfile error handling logging 2025-07-10 23:26:51 +02:00
subscription Improve few errdetail messages introduced in commit 0d48d393d4. 2025-09-19 04:52:59 +00:00
Makefile Add PG_TEST_EXTRA configure option to the Make builds 2024-11-04 14:09:38 +02:00
meson.build Update copyright for 2025 2025-01-01 11:21:55 -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