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Concurrent autovacuum could result in a change in the order of the live rows in timestamp_tbl. While this would not happen with the default autovacuum parameters, it's fairly easy to hit if autovacuum_vacuum_threshold is made small enough to allow autovac to decide to process this table. That's a stumbling block for trying to exercise autovacuum aggressively using the core regression tests. To fix, replace an unqualified DELETE with a TRUNCATE. There's a similar DELETE just above (and no order-sensitive queries between), so this doesn't lose any test coverage and might indeed be argued to improve it. Discussion: https://postgr.es/m/17428.1555348950@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/.