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Commit d168b66682, which overhauled index deletion, added a pg_unreachable() to the end of a sort comparator used when sorting heap TIDs from an index page. This allows the compiler to apply optimizations that assume that the heap TIDs from the index AM must always be unique. That doesn't seem like a good idea now, given recent reports of corruption involving duplicate TIDs in indexes on Postgres 14. Demote to an assertion, just in case. Backpatch: 14-, where index deletion was overhauled.
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/.