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Before this commit slot_getattr() checked for dropped columns (returning NULL in that case), but only after checking for previously deformed columns. As slot_deform_tuple() does not contain such a check, the check in slot_getattr() would often not have been reached, depending on previous use of the slot. These days locking and plan invalidation ought to ensure that dropped columns are not accessed in query plans. Therefore this commit just drops the insufficient check in slot_getattr(). It's possible that we'll find some holes againt use of dropped columns, but if so, those need to be addressed independent of slot_getattr(), as most accesses don't go through that function anyway. Author: Andres Freund Discussion: https://postgr.es/m/20181107174403.zai7fedgcjoqx44p@alap3.anarazel.de |
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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/.