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When converting an RTE with securityQuals into a security barrier subquery RTE, ensure that the Vars in the new subquery's targetlist all have varlevelsup = 0 so that they correctly refer to the underlying base relation being wrapped. The original code was creating new Vars by copying them from existing Vars referencing the base relation found elsewhere in the query, but failed to account for the fact that such Vars could come from sublink subqueries, and hence have varlevelsup > 0. In practice it looks like this could only happen with nested security barrier views, where the outer view has a WHERE clause containing a correlated subquery, due to the order in which the Vars are processed. Bug: #13988 Reported-by: Adam Guthrie Backpatch-to: 9.4, where updatable SB views were introduced |
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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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.