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The pg_stat_activity view shows information for aux processes, but the pg_stat_get_backend_wait_event() and pg_stat_get_backend_wait_event_type() functions did not. To fix, call AuxiliaryPidGetProc(pid) if BackendPidGetProc(pid) returns NULL, like we do in pg_stat_get_activity(). In version 17 and above, it's a little silly to use those functions when we already have the ProcNumber at hand, but it was necessary before v17 because the backend ID was different from ProcNumber. I have other plans for wait_event_info on master, so it doesn't seem worth applying a different fix on different versions now. Reviewed-by: Sami Imseih <samimseih@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Discussion: https://www.postgresql.org/message-id/c0320e04-6e85-4c49-80c5-27cfb3a58108@iki.fi Backpatch-through: 14
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/.