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According to the comments, when an invalid or dropped column oid is passed to has_column_privilege(), the intention has always been to return NULL. However, when the caller had table level privilege the invalid/missing column was never discovered, because table permissions were checked first. Fix that by introducing extended versions of pg_attribute_acl(check|mask) and pg_class_acl(check|mask) which take a new argument, is_missing. When is_missing is NULL, the old behavior is preserved. But when is_missing is passed by the caller, no ERROR is thrown for dropped or missing columns/relations, and is_missing is flipped to true. This in turn allows has_column_privilege to check for column privileges first, providing the desired semantics. Not backpatched since it is a user visible behavioral change with no previous complaints, and the fix is a bit on the invasive side. Author: Joe Conway Reviewed-By: Tom Lane Reported by: Ian Barwick Discussion: https://postgr.es/m/flat/9b5f4311-157b-4164-7fe7-077b4fe8ed84%40joeconway.com |
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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/.