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Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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Noah Misch 0cecc908e9 Lock before setting relhassubclass on RELKIND_PARTITIONED_INDEX. 
Commit 5b562644fe added a comment that
SetRelationHasSubclass() callers must hold this lock.  When commit
17f206fbc8 extended use of this column to
partitioned indexes, it didn't take the lock.  As the latter commit
message mentioned, we currently never reset a partitioned index to
relhassubclass=f.  That largely avoids harm from the lock omission.  The
cause for fixing this now is to unblock introducing a rule about locks
required to heap_update() a pg_class row.  This might cause more
deadlocks.  It gives minor user-visible benefits:

- If an ALTER INDEX SET TABLESPACE runs concurrently with ALTER TABLE
  ATTACH PARTITION or CREATE PARTITION OF, one transaction blocks
  instead of failing with "tuple concurrently updated".  (Many cases of
  DDL concurrency still fail that way.)

- Match ALTER INDEX ATTACH PARTITION in choosing to lock the index.

While not user-visible today, we'll need this if we ever make something
set the flag to false for a partitioned index, like ANALYZE does today
for tables.  Back-patch to v12 (all supported versions), the plan for
the commit relying on the new rule.  In back branches, add
LockOrStrongerHeldByMe() instead of adding a LockHeldByMe() parameter.

Reviewed (in an earlier version) by Robert Haas.

Discussion: https://postgr.es/m/20240611024525.9f.nmisch@google.com
2024-06-27 19:21:05 -07:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib Unify some error messages 2024-06-20 11:10:26 +02:00
doc Add wait event type "InjectionPoint", a custom type like "Extension". 2024-06-27 19:21:05 -07:00
src Lock before setting relhassubclass on RELKIND_PARTITIONED_INDEX. 2024-06-27 19:21:05 -07:00
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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.

Copyright and license information can be found in the file COPYRIGHT.

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