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The multivariate MCV estimation code may run user-defined operators on the values in the MCV list, which means that those operators may potentially leak the values from the MCV list. Guard against leaking data to unprivileged users by checking that the user has SELECT privileges on the table or all of the columns referred to by the statistics. Additionally, if there are any securityQuals on the RTE (either due to RLS policies on the table, or accessing the table via a security barrier view), not all rows may be visible to the current user, even if they have table or column privileges. Thus we further insist that the operator be leakproof in this case. Dean Rasheed, reviewed by Tomas Vondra. Discussion: https://postgr.es/m/CAEZATCUhT9rt7Ui=Vdx4N==VV5XOK5dsXfnGgVOz_JhAicB=ZA@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. 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/.