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Instead of disabling autovacuum on these test tables, adjust the partition boundaries so that the child partitions are not all the same size. That should cause the planner to use a predictable ordering of the per-partition scan nodes even in cases where autovacuum causes the rowcount estimates to be off a bit. Moreover, this also lets these tests show that the planner does properly order the tables in descending size order, something that wasn't being proven before. The pagg_tab1 and pagg_tab2 partitions are still all the same size, but that should be fine, because those tables are so small that (1) autovacuum won't fire on them, and (2) even if it did, it couldn't change the reltuples value --- with only one page, it can't see just part of the relation. Discussion: https://postgr.es/m/24467.1585838693@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/.