Álvaro Herrera ea06f97eeb 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		4 months ago
config	Don't put library-supplied -L/-I switches before user-supplied ones.	6 months ago
contrib	pgstattuple: Improve reports generated for indexes (hash, gist, btree)	4 months ago
doc	doc: Remove trailing whitespace in xref	5 months ago
src	Stop creating constraints during DETACH CONCURRENTLY	4 months ago
.cirrus.star	ci: Simplify ci-os-only handling	6 months ago
.cirrus.tasks.yml	ci: Simplify ci-os-only handling	6 months ago
.cirrus.yml	ci: Per-repo configuration for manually trigger tasks	6 months ago
.dir-locals.el	…
.editorconfig	…
.git-blame-ignore-revs	Add commit `7229ebe011` to .git-blame-ignore-revs.	1 year ago
.gitattributes	Fix git whitespace warning	6 months ago
.gitignore	Update top-level .gitignore.	3 years ago
COPYRIGHT	Align organization wording in copyright statement	9 months ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	2 years ago
HISTORY	…
Makefile	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
README.md	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
aclocal.m4	autoconf: Move export_dynamic determination to configure	3 years ago
configure	Stamp 17.6.	6 months ago
configure.ac	Stamp 17.6.	6 months ago
meson.build	Fix meson build with -Duuid=ossp when using version older than 0.60	5 months ago
meson_options.txt	Allow selecting the git revision to be packaged by "make dist".	2 years ago

README.md

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.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.