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The data types that contrib/pageinspect's bt_metap() function were declared to return as OUT arguments were wrong in some cases. For example, the oldest_xact column (a TransactionId/xid field) was declared integer/int4 within the pageinspect extension's sql file. This led to errors when an oldest_xact value that exceeded 2^31-1 was encountered. Some of the other columns were defined incorrectly ever since pageinspect was first introduced, though they were far less likely to produce problems in practice. Fix these issues by changing the declaration of bt_metap() to consistently use data types that can reliably represent all possible values. This fixes things on HEAD only. No backpatch, since it doesn't seem like there is a safe way to fix the issue without including a new version of the pageinspect extension (HEAD/Postgres 13 already introduced a new version of the extension). Besides, the oldest_xact issue has been around since the release of Postgres 11, and we haven't heard any complaints about it before now. Also, throw an error when we detect a bt_metap() declaration that must be from an old version of the pageinspect extension by examining the number of attributes from the tuple descriptor for the return tuples. It seems better to throw an error in a reliable and obvious way following a Postgres upgrade, rather than letting bt_metap() fail unpredictably. The problem is fundamentally with the CREATE FUNCTION declared data types themselves, so I see no sensible alternative. Reported-By: Victor Yegorov Bug: #16285 Discussion: https://postgr.es/m/16285-df8fc1000ab3d5fc@postgresql.org |
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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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.