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ANALYZE sets relhassubclass=f when a partitioned table no longer has partitions. An ANALYZE doing that proceeded to apply the inplace update of pg_class.reltuples to the old pg_class tuple instead of the new tuple, losing that reltuples=0 change if the ANALYZE committed. Non-partitioning inheritance trees were unaffected. Back-patch to v14, where commit 375aed36ad83f0e021e9bdd3a0034c0c992c66dc introduced maintenance of partitioned table pg_class.reltuples. Reported by Alexander Lakhin. Discussion: https://postgr.es/m/a295b499-dcab-6a99-c06e-01cf60593344@gmail.com
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/.