f3ea3e3e82
find_expr_references() neglected to record a dependency on the result type of a FieldSelect node, allowing a DROP TYPE to break a view or rule that contains such an expression. I think we'd omitted this case intentionally, reasoning that there would always be a related dependency ensuring that the DROP would cascade to the view. But at least with nested field selection expressions, that's not true, as shown in bug #14867 from Mansur Galiev. Add the dependency, and for good measure a dependency on the node's exposed collation. Likewise add a dependency on the result type of a FieldStore. I think here the reasoning was that it'd only appear within an assignment to a field, and the dependency on the field's column would be enough ... but having seen this example, I think that's wrong for nested-composites cases. Looking at nearby code, I notice we're not recording a dependency on the exposed collation of CoerceViaIO, which seems inconsistent with our choices for related node types. Maybe that's OK but I'm feeling suspicious of this code today, so let's add that; it certainly can't hurt. This patch does not do anything to protect already-existing views, only views created after it's installed. But seeing that the issue has been there a very long time and nobody noticed till now, that's probably good enough. Back-patch to all supported branches. Discussion: https://postgr.es/m/20171023150118.1477.19174@wrigleys.postgresql.org |
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| README.git | ||
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README
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/.