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EventTriggerTableRewrite crashed if there were table_rewrite triggers present, but there had not been when the calling command started. EventTriggerDDLCommandEnd called ddl_command_end triggers if present, even if there had been no such triggers when the calling command started, which would lead to a failure in pg_event_trigger_ddl_commands. In both cases, fix by doing nothing; it's better to wait till the next command when things will be properly initialized. In passing, remove an elog(DEBUG1) call that might have seemed interesting four years ago but surely isn't today. We found this because of intermittent failures in the buildfarm. Thanks to Alvaro Herrera and Andrew Gierth for analysis. Back-patch to 9.5; some of this code exists before that, but the specific hazards we need to guard against don't. Discussion: https://postgr.es/m/5767.1523995174@sss.pgh.pa.us
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/.