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The buildfarm occasionally shows a variant row order in the output of this UPDATE ... RETURNING, implying that the preceding INSERT dropped one of the rows into some free space within the table rather than appending them all at the end. It's not entirely clear why that happens some times and not other times, but we have established that it's affected by concurrent activity in other databases of the cluster. In any case, the behavior is not wrong; the test is at fault for presuming that a seqscan will give deterministic row ordering. Add an ORDER BY atop the update to stop the buildfarm noise. The buildfarm seems to have shown this only in v18 and master branches, but just in case the cause is older, back-patch to all supported branches. Discussion: https://postgr.es/m/3866274.1770743162@sss.pgh.pa.us 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/.