77f54eb074
Array values embed their element type's OID, and pg_upgrade does not rewrite user data. The OIDs of information_schema domains can vary between major versions, so a stored array over one (e.g. by aggregating an information_schema query into a table) comes through the upgrade with at best a dangling element OID. Whole-array reads and pg_dump of the upgraded cluster then fail with "cache lookup failed for type N". Worst case, the OID has been reassigned, leading to values being misread instead. The data type checks miss this because nothing flags the domain itself: domain storage is just the base type, so the recursive expansion in data_type_check_query() never reaches the array type. Add a check for arrays whose element type OID was assigned by genbki.pl or initdb, including anything in information_schema in case it was dropped and reloaded. The scenarios that hit this are fairly contrived, which probably explains the lack of field reports, so no backpatch for now. Reviewed-by: Chengpeng Yan <chengpeng_yan@outlook.com> Discussion: https://postgr.es/m/CANWCAZbusXHWWSq_9NpxtOGvR=M5MH4Uj+wO0f1_rtC0uMeSWg@mail.gmail.com
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/.