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brin.sql included a call of brin_summarize_new_values(), and expected it to always report exactly 5 summarization events. This failed sometimes during parallel regression tests, as a consequence of the database-wide VACUUM in gist.sql getting there first. The most future-proof way to avoid variation in the test results is to forget about using brin_summarize_new_values() and just do a plain "VACUUM brintest", which will exercise the same code anyway. Having done that, there's no need for preventing autovacuum on brintest; doing so just reduces the scope of test coverage, so let's not.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.