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pg_dump sorts objects by their logical names, e.g. (nspname, relname, tgname), before dependency-driven reordering. That removes one source of logically-identical databases differing in their schema-only dumps. In other words, it helps with schema diffing. The logical name sort ignored essential sort keys for constraints, operators, PUBLICATION ... FOR TABLE, PUBLICATION ... FOR TABLES IN SCHEMA, operator classes, and operator families. pg_dump's sort then depended on object OID, yielding spurious schema diffs. After this change, OIDs affect dump order only in the event of catalog corruption. While pg_dump also wrongly ignored pg_collation.collencoding, CREATE COLLATION restrictions have been keeping that imperceptible in practical use. Use techniques like we use for object types already having full sort key coverage. Where the pertinent queries weren't fetching the ignored sort keys, this adds columns to those queries and stores those keys in memory for the long term. The ignorance of sort keys became more problematic when commit 172259afb563d35001410dc6daad78b250924038 added a schema diff test sensitive to it. Buildfarm member hippopotamus witnessed that. However, dump order stability isn't a new goal, and this might avoid other dump comparison failures. Hence, back-patch to v13 (all supported versions). Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/20250707192654.9e.nmisch@google.com Backpatch-through: 13
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/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/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/.