7204f35919
This reverts 66c0185a3 (Allow planner to use Merge Append to efficiently implement UNION) as well as the follow-on commits d5d2205c8, 3b1a7eb28, 7487044d6. In addition to those, 07746a8ef had to be removed then re-applied in a different place, because 66c0185a3 moved the relevant code. The reason for this last-minute thrashing is that depesz found a case in which the patched code creates a completely wrong plan that silently gives incorrect query results. It's unclear what the cause is or how many cases are affected, but with beta1 wrap staring us in the face, there's no time for closer investigation. After we figure that out, we can decide whether to un-revert this for beta2 or hold it for v18. Discussion: https://postgr.es/m/Zktzf926vslR35Fv@depesz.com (also some private discussion among pgsql-release)
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/.