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When swapping the dependencies of the old and new indexes, the code has been correctly switching all links in pg_depend from the old to the new index for both referencing and referenced entries. However it forgot the fact that the new index may itself have existing entries in pg_depend, like references to the parent table attributes. This resulted in duplicated entries in pg_depend after running REINDEX CONCURRENTLY. Fix this problem by removing any existing entries in pg_depend on the new index before switching the dependencies of the old index to the new one. More regression tests are added to check the consistency of entries in pg_depend for indexes, including partition indexes. Author: Michael Paquier Discussion: https://postgr.es/m/20191025064318.GF8671@paquier.xyz Backpatch-through: 12
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/.