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After more discussion, the new function added by ddbd5d8 could have been designed in a better way. Based on an idea from Álvaro, instead of returning one column which includes both the raw and combined flags, use two columns, with one for the raw flags and one for the combined flags. This also takes care of some issues with HEAP_LOCKED_UPGRADED and HEAP_XMAX_IS_LOCKED_ONLY which are not really combined flags as they depend on conditions defined by other raw bits, as mentioned by Amit. While on it, fix an extra issue with combined flags. A combined flag was returned if at least one of its bits was set, but all its bits need to be set to include it in the result. Author: Michael Paquier Reviewed-by: Álvaro Herrera, Amit Kapila Discussion: https://postgr.es/m/20190913114950.GA3824@alvherre.pgsql
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/.