c899c6839f
If a partition undergoes DETACH CONCURRENTLY immediately followed by DROP, this could cause a problem for a concurrent transaction recomputing the partition descriptor when running a prepared statement, because it tries to dereference a pointer to a tuple that's not found in a catalog scan. The existing retry logic added in commit dbca3469ebf8 is sufficient to cope with the overall problem, provided we don't try to dereference a non-existant heap tuple. Arguably, the code in RelationBuildPartitionDesc() has been wrong all along, since no check was added in commit 898e5e3290a7 against receiving a NULL tuple from the catalog scan; that bug has only become user-visible with DETACH CONCURRENTLY which was added in branch 14. Therefore, even though there's no known mechanism to cause a crash because of this, backpatch the addition of such a check to all supported branches. In branches prior to 14, this would cause the code to fail with a "missing relpartbound for relation XYZ" error instead of crashing; that's okay, because there are no reports of such behavior anyway. Author: Kuntal Ghosh <kuntalghosh.2007@gmail.com> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/18559-b48286d2eacd9a4e@postgresql.org
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/.