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currentCommandIdUsed is only used to skip redundant increments of the command counter, and CommandCounterIncrement() is categorically denied under parallelism anyway. Therefore, it's OK for GetCurrentCommandId() to mark the counter value used, as long as it happens in the leader, not a worker. Prior to commite9baa5e9fa, the slightly incorrect check didn't matter, but now it does. A test case added by commit1804284042uncovered the problem by accident; it caused failures with force_parallel_mode=on/regress. Report and review by Andres Freund. Patch by me. Discussion: http://postgr.es/m/20171221143106.5lhtygohvmazli3x@alap3.anarazel.de
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/.