9879105024
Presently, --missing-stats-only skips relations with reltuples set to 0 because empty relations don't get optimizer statistics. However, before v14, a reltuples value of 0 was ambiguous: it could either mean the relation is empty, or it could mean that it hadn't yet been vacuumed or analyzed. (Commit 3d351d916b taught v14 and newer to use -1 for the latter case.) This ambiguity can cause --missing-stats-only to inadvertently skip relations that need optimizer statistics after upgrades to v18 and newer (since reltuples is now transferred from the old cluster). To fix, simply remove the check for reltuples != 0. This will cause --missing-stats-only to analyze some empty tables, but that doesn't seem too terrible a trade-off. Reported-by: Christoph Berg <myon@debian.org> Reviewed-by: Christoph Berg <myon@debian.org> Discussion: https://postgr.es/m/aAjyvW5_fRGNr7yF%40msg.df7cb.de
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.