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When creating a cast that uses a conversion function, we've historically allowed the input and result types to be binary-compatible with the function's input and result types, rather than necessarily being identical. This means that the new cast is logically dependent on the binary-compatible cast or casts that it references: if those are defined by pg_cast entries, and you try to restore the new cast without having defined them, it'll fail. Hence, we should make pg_depend entries to record these dependencies so that pg_dump knows that there is an ordering requirement. This is not the only place where we allow such shortcuts; aggregate functions for example are similarly lax, and in principle should gain similar dependencies. However, for now it seems sufficient to fix the cast-versus-cast case, as pg_dump's other ordering heuristics should keep it out of trouble for other object types. Per report from David Turoň; thanks also to Robert Haas for preliminary investigation. I considered back-patching, but seeing that this issue has existed for many years without previous reports, it's not clear it's worth the trouble. Moreover, back-patching wouldn't be enough to ensure that the new pg_depend entries exist in existing databases anyway. Discussion: https://postgr.es/m/OF0A160F3E.578B15D1-ONC12588DA.003E4857-C12588DA.0045A428@notes.linuxbox.cz |
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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/.